Index: t3lib/class.t3lib_autoloader.php
===================================================================
--- t3lib/class.t3lib_autoloader.php	(revision 6054)
+++ t3lib/class.t3lib_autoloader.php	(working copy)
@@ -113,11 +113,33 @@
 		}
 
 		if (!class_exists($className, false) && !interface_exists($className, false)) {
-			self::logLoadingFailure($className);
+			// Last attempt to load the class
+			if (!self::namingConventionAutoload($className)) {
+				self::logLoadingFailure($className);
+			}
 		}
 	}
 
 	/**
+	 * Autoload function for TYPO3 based on Extbase naming conventions.
+	 * 
+	 * @param	string	$className	Class name
+	 * @return	boolean	TRUE if class could finally be loaded, otherwise FALSE
+	 */
+	static protected function namingConventionAutoload($className) {
+		$classNameParts = explode('_', $className);
+		if (array_shift($classNameParts) !== 'Tx') {
+			return;
+		}
+		$extensionKey = strtolower(array_shift($classNameParts));
+		$classPath = t3lib_extMgm::extPath($extensionKey) . 'Classes/' . implode('/', $classNameParts) . '.php';
+		if (file_exists($classPath)) {
+			t3lib_div::requireFile($classPath);
+		}
+		return (class_exists($className, false) || interface_exists($className, false));
+	}
+	
+	/**
 	 * Load the core registry into $classNameToFileMapping, effectively overriding
 	 * the whole contents of $classNameToFileMapping.
 	 *