diff --git a/Classes/PHPExcel/CachedObjectStorage/CacheBase.php b/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
index 6119a34..4dd06fd 100644
--- a/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
+++ b/Classes/PHPExcel/CachedObjectStorage/CacheBase.php
@@ -85,7 +85,6 @@ class PHPExcel_CachedObjectStorage_CacheBase {
 	 *	Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
 	 *
 	 *	@param	string		$pCoord		Coordinate address of the cell to check
-	 *	@return	void
 	 *	@return	boolean
 	 */
 	public function isDataSet($pCoord) {
@@ -146,7 +145,7 @@ class PHPExcel_CachedObjectStorage_CacheBase {
 	 */
 	public function getSortedCellList() {
 		$sortKeys = array();
-		foreach (array_keys($this->_cellCache) as $coord) {
+		foreach ($this->getCellList() as $coord) {
 			list($column,$row) = sscanf($coord,'%[A-Z]%d');
 			$sortKeys[sprintf('%09d%3s',$row,$column)] = $coord;
 		}
diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite.php b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
new file mode 100644
index 0000000..6a74f58
--- /dev/null
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite.php
@@ -0,0 +1,211 @@
+<?php
+/**
+ * PHPExcel
+ *
+ * Copyright (c) 2006 - 2010 PHPExcel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version    ##VERSION##, ##DATE##
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_SQLite
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_SQLite extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	private $_TableName = null;
+	private $_DBHandle = null;
+
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			$this->_DBHandle->queryExec("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES('".$this->_currentObjectID."','".sqlite_escape_string(serialize($this->_currentObject))."')");
+			$this->_currentCellIsDirty = false;
+		}
+		$this->_currentObjectID = $this->_currentObject = null;
+	}	//	function _storeData()
+
+
+    /**
+     *	Add or Update a cell in cache identified by coordinate address
+     *
+     *	@param	string			$pCoord		Coordinate address of the cell to update
+     *	@param	PHPExcel_Cell	$cell		Cell to update
+	 *	@return	void
+     *	@throws	Exception
+     */
+	public function addCacheData($pCoord, PHPExcel_Cell $cell) {
+		if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
+			$this->_storeData();
+		}
+
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = $cell;
+		$this->_currentCellIsDirty = true;
+
+		return $cell;
+	}	//	function addCacheData()
+
+
+    /**
+     * Get cell at a specific coordinate
+     *
+     * @param 	string 			$pCoord		Coordinate of the cell
+     * @throws 	Exception
+     * @return 	PHPExcel_Cell 	Cell that was found, or null if not found
+     */
+	public function getCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return $this->_currentObject;
+		}
+		$this->_storeData();
+
+		$query = "SELECT value FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResultSet = $this->_DBHandle->query($query,SQLITE_ASSOC);
+		if ($cellResultSet->numRows() == 0) {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+
+		$cellResult = $cellResultSet->fetchSingle();
+		$this->_currentObject = unserialize($cellResult);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 *	Is a value set for an indexed cell?
+	 *
+	 *	@param	string		$pCoord		Coordinate address of the cell to check
+	 *	@return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return true;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "SELECT id FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResultSet = $this->_DBHandle->query($query,SQLITE_ASSOC);
+		if ($cellResultSet->numRows() == 0) {
+			//	Return null if requested entry doesn't exist in cache
+			return false;
+		}
+		return true;
+	}	//	function isDataSet()
+
+
+    /**
+     *	Delete a cell in cache identified by coordinate address
+     *
+     *	@param	string			$pCoord		Coordinate address of the cell to delete
+     *	@throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			$this->_currentObject->detach();
+			$this->_currentObjectID = $this->_currentObject = null;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "DELETE FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$this->_DBHandle->queryExec($query);
+
+		$this->_currentCellIsDirty = false;
+	}	//	function deleteCacheData()
+
+
+	/**
+	 *	Get a list of all cell addresses currently held in cache
+	 *
+	 *	@return	array of string
+	 */
+	public function getCellList() {
+		$query = "SELECT id FROM kvp_".$this->_TableName;
+		$cellIdsResult = $this->_DBHandle->unbufferedQuery($query,SQLITE_ASSOC);
+
+		$cellKeys = array();
+		foreach($cellIdsResult as $row) {
+			$cellKeys[] = $row['id'];
+		}
+
+		return $cellKeys;
+	}	//	function getCellList()
+
+
+	/**
+	 *	Clone the cell collection
+	 *
+	 *	@return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		//	Get a new id for the new table name
+		$tableName = str_replace('.','_',$this->_getUniqueID());
+		$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
+		                                       AS SELECT * FROM kvp_'.$this->_TableName);
+
+		//	Copy the existing cell cache file
+		$this->_TableName = $tableName;
+	}	//	function copyCellCollection()
+
+
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+		//	detach ourself from the worksheet, so that it can then delete this object successfully
+		$this->_parent = null;
+
+		//	Close down the temporary cache file
+		$this->__destruct();
+	}	//	function unsetWorksheetCells()
+
+
+	public function __construct(PHPExcel_Worksheet $parent) {
+		parent::__construct($parent);
+		if (is_null($this->_DBHandle)) {
+			$this->_TableName = str_replace('.','_',$this->_getUniqueID());
+			$_DBName = ':memory:';
+
+			$this->_DBHandle = new SQLiteDatabase($_DBName);
+			$this->_DBHandle->queryExec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)');
+		}
+	}	//	function __construct()
+
+
+	public function __destruct() {
+		$this->_DBHandle = null;
+	}	//	function __destruct()
+
+}
diff --git a/Classes/PHPExcel/CachedObjectStorage/SQLite3.php b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
new file mode 100644
index 0000000..0a49520
--- /dev/null
+++ b/Classes/PHPExcel/CachedObjectStorage/SQLite3.php
@@ -0,0 +1,219 @@
+<?php
+/**
+ * PHPExcel
+ *
+ * Copyright (c) 2006 - 2010 PHPExcel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version    ##VERSION##, ##DATE##
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_SQLite3
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2010 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_SQLite3 extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	private $_TableName = null;
+	private $_DBHandle = null;
+
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			$query = $this->_DBHandle->prepare("INSERT OR REPLACE INTO kvp_".$this->_TableName." VALUES(:id,:data)");
+			$query->bindValue('id',$this->_currentObjectID,SQLITE3_TEXT);
+			$query->bindValue('data',serialize($this->_currentObject),SQLITE3_BLOB);
+			$query->execute();
+			$this->_currentCellIsDirty = false;
+		}
+		$this->_currentObjectID = $this->_currentObject = null;
+	}	//	function _storeData()
+
+
+    /**
+     *	Add or Update a cell in cache identified by coordinate address
+     *
+     *	@param	string			$pCoord		Coordinate address of the cell to update
+     *	@param	PHPExcel_Cell	$cell		Cell to update
+	 *	@return	void
+     *	@throws	Exception
+     */
+	public function addCacheData($pCoord, PHPExcel_Cell $cell) {
+		if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
+			$this->_storeData();
+		}
+
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = $cell;
+		$this->_currentCellIsDirty = true;
+
+		return $cell;
+	}	//	function addCacheData()
+
+
+    /**
+     * Get cell at a specific coordinate
+     *
+     * @param 	string 			$pCoord		Coordinate of the cell
+     * @throws 	Exception
+     * @return 	PHPExcel_Cell 	Cell that was found, or null if not found
+     */
+	public function getCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return $this->_currentObject;
+		}
+		$this->_storeData();
+
+		$query = "SELECT value FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResult = $this->_DBHandle->querySingle($query);
+		if (is_null($cellResult)) {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+
+		$this->_currentObject = unserialize($cellResult);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	/**
+	 *	Is a value set for an indexed cell?
+	 *
+	 *	@param	string		$pCoord		Coordinate address of the cell to check
+	 *	@return	boolean
+	 */
+	public function isDataSet($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return true;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "SELECT id FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$cellResult = $this->_DBHandle->querySingle($query);
+		if (is_null($cellResult)) {
+			//	Return null if requested entry doesn't exist in cache
+			return false;
+		}
+		return true;
+	}	//	function isDataSet()
+
+
+    /**
+     *	Delete a cell in cache identified by coordinate address
+     *
+     *	@param	string			$pCoord		Coordinate address of the cell to delete
+     *	@throws	Exception
+     */
+	public function deleteCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			$this->_currentObject->detach();
+			$this->_currentObjectID = $this->_currentObject = null;
+		}
+
+		//	Check if the requested entry exists in the cache
+		$query = "DELETE FROM kvp_".$this->_TableName." WHERE id='".$pCoord."'";
+		$this->_DBHandle->exec($query);
+
+		$this->_currentCellIsDirty = false;
+	}	//	function deleteCacheData()
+
+
+	/**
+	 *	Get a list of all cell addresses currently held in cache
+	 *
+	 *	@return	array of string
+	 */
+	public function getCellList() {
+		$query = "SELECT id FROM kvp_".$this->_TableName;
+		$cellIdsResult = $this->_DBHandle->query($query);
+
+		$cellKeys = array();
+		while ($row = $cellIdsResult->fetchArray(SQLITE3_ASSOC)) {
+			$cellKeys[] = $row['id'];
+		}
+
+		return $cellKeys;
+	}	//	function getCellList()
+
+
+	/**
+	 *	Clone the cell collection
+	 *
+	 *	@return	void
+	 */
+	public function copyCellCollection(PHPExcel_Worksheet $parent) {
+		//	Get a new id for the new table name
+		$tableName = str_replace('.','_',$this->_getUniqueID());
+		$this->_DBHandle->exec('CREATE TABLE kvp_'.$tableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)
+		                                  AS SELECT * FROM kvp_'.$this->_TableName);
+
+		//	Copy the existing cell cache file
+		$this->_TableName = $tableName;
+	}	//	function copyCellCollection()
+
+
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+		//	detach ourself from the worksheet, so that it can then delete this object successfully
+		$this->_parent = null;
+
+		//	Close down the temporary cache file
+		$this->__destruct();
+	}	//	function unsetWorksheetCells()
+
+
+	public function __construct(PHPExcel_Worksheet $parent) {
+		parent::__construct($parent);
+		if (is_null($this->_DBHandle)) {
+			$this->_TableName = str_replace('.','_',$this->_getUniqueID());
+			$_DBName = ':memory:';
+//			$_DBName = PHPExcel_Shared_File::sys_get_temp_dir().'/PHPExcel.sqlite3';
+
+			$this->_DBHandle = new SQLite3($_DBName);
+			$this->_DBHandle->exec('CREATE TABLE kvp_'.$this->_TableName.' (id VARCHAR(12) PRIMARY KEY, value BLOB)');
+		}
+	}	//	function __construct()
+
+
+	public function __destruct() {
+		if (!is_null($this->_DBHandle)) {
+//			$this->_DBHandle->exec('DROP TABLE kvp_'.$this->_TableName);
+
+			$this->_DBHandle->close();
+		}
+		$this->_DBHandle = null;
+	}	//	function __destruct()
+
+}
diff --git a/Classes/PHPExcel/CachedObjectStorageFactory.php b/Classes/PHPExcel/CachedObjectStorageFactory.php
index cd402b2..d6e39b0 100644
--- a/Classes/PHPExcel/CachedObjectStorageFactory.php
+++ b/Classes/PHPExcel/CachedObjectStorageFactory.php
@@ -9,6 +9,8 @@ class PHPExcel_CachedObjectStorageFactory {
 	const cache_to_memcache				= 'Memcache';
 	const cache_to_phpTemp				= 'PHPTemp';
 	const cache_to_wincache				= 'Wincache';
+	const cache_to_sqlite				= 'SQLite';
+	const cache_to_sqlite3				= 'SQLite3';
 
 
 	private static $_cacheStorageMethod = null;
@@ -25,6 +27,8 @@ class PHPExcel_CachedObjectStorageFactory {
 		self::cache_to_apc,
 		self::cache_to_memcache,
 		self::cache_to_wincache,
+		self::cache_to_sqlite,
+		self::cache_to_sqlite3,
 	);
 
 
@@ -46,7 +50,11 @@ class PHPExcel_CachedObjectStorageFactory {
 													  'cacheTime'		=> 600
 													),
 		self::cache_to_wincache				=> array( 'cacheTime'		=> 600
-													)
+													),
+		self::cache_to_sqlite				=> array(
+													),
+		self::cache_to_sqlite3				=> array(
+													),
 	);
 
 
@@ -98,6 +106,16 @@ class PHPExcel_CachedObjectStorageFactory {
 					return false;
 				}
 				break;
+			case self::cache_to_sqlite :
+				if (!function_exists('sqlite_open')) {
+					return false;
+				}
+				break;
+			case self::cache_to_sqlite3 :
+				if (!class_exists('SQLite3')) {
+					return false;
+				}
+				break;
 		}
 
 		self::$_storageMethodParameters[$method] = self::$_storageMethodDefaultParameters[$method];
diff --git a/Documentation/PHPExcel developer documentation.doc b/Documentation/PHPExcel developer documentation.doc
index 02b7839..cfa95e5 100644
Binary files a/Documentation/PHPExcel developer documentation.doc and b/Documentation/PHPExcel developer documentation.doc differ
diff --git a/changelog.txt b/changelog.txt
index 6535e0f..2a29def 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -24,6 +24,7 @@
 
 
 Fixed in SVN:
+- Feature:  (MBaker)    Option for cell caching using SQLite.
 - General:  (MBaker)    Fix to build to ensure that Examples are included with the documentation
 - General:  (MBaker)    Reduce cell caching overhead using dirty flag to ensure that cells are only rewritten to the cache if they have actually been changed
 - General:  (MBaker)    Improved memory usage in CSV Writer