diff --git a/laravel/autoloader.php b/laravel/autoloader.php
index 61826de7..5c05b551 100644
--- a/laravel/autoloader.php
+++ b/laravel/autoloader.php
@@ -56,19 +56,21 @@ class Autoloader {
 			require static::$mappings[$class];
 		}
 
+		// If the class namespace is mapped to a directory, we will load the
+		// class using the PSR-0 standards from that directory; however, we
+		// will trim off the beginning of the namespace to account for
+		// the root of the mapped directory.
+		if ( ! is_null($info = static::namespaced($class)))
+		{
+			$class = substr($class, strlen($info['namespace']));
+
+			return static::load_psr($class, $info['directory']);
+		}
+
 		elseif (($slash = strpos($class, '\\')) !== false)
 		{
 			$namespace = substr($class, 0, $slash);
 
-			// If the class namespace is mapped to a directory, we will load the class
-			// using the PSR-0 standards from that directory; however, we will trim
-			// off the beginning of the namespace to account for files in the root
-			// of the mapped directory.
-			if ( ! is_null($directory = static::directory($class)))
-			{
-				return static::load_psr(substr($class, $slash + 1), $directory);
-			}
-
 			// If the class is namespaced to an existing bundle and the bundle has
 			// not been started, we will start the bundle and attempt to load the
 			// class file again. If that fails, an error will be thrown by PHP.
@@ -91,23 +93,6 @@ class Autoloader {
 		static::load_psr($class);
 	}
 
-	/**
-	 * Get the directory associated with a given namespaced class.
-	 *
-	 * @param  string  $class
-	 * @return string
-	 */
-	protected static function directory($class)
-	{
-		foreach (static::$namespaces as $namespace => $directory)
-		{
-			if (starts_with($class, $namespace))
-			{
-				return $directory;
-			}
-		}
-	}
-
 	/**
 	 * Attempt to resolve a class using the PSR-0 standard.
 	 *
@@ -154,6 +139,26 @@ class Autoloader {
 		}
 	}
 
+	/**
+	 * Get the directory for a given namespaced class.
+	 *
+	 * @param  string  $class
+	 * @return string
+	 */
+	protected static function namespaced($class)
+	{
+		foreach (static::$namespaces as $namespace => $directory)
+		{
+			// If the class begins with one of the registered namespaces,
+			// we'll return both the namespace and the directory, which
+			// will allow us to use PSR-0 to load the class.
+			if (starts_with($class, $namespace))
+			{
+				return compact('namespace', 'directory');
+			}
+		}
+	}
+
 	/**
 	 * Register an array of class to path mappings.
 	 *
@@ -203,11 +208,26 @@ class Autoloader {
 	 */
 	public static function namespaces($mappings)
 	{
-		$directories = static::format(array_values($mappings));
+		foreach ($mappings as $namespace => $directory)
+		{
+			$namespace = trim($namespace, '\\').'\\';
 
-		$mappings = array_combine(array_keys($mappings), $directories);
+			static::$namespaces[$namespace] = head(static::format($directory));
+		}
+	}
 
-		static::$namespaces = array_merge(static::$namespaces, $mappings);
+	/**
+	 * Register underscored "namespaces" to directory mappings.
+	 *
+	 * @param  array  $mappings
+	 * @return void
+	 */
+	public static function underscored($mappings)
+	{
+		foreach ($mappings as $namespace => $directory)
+		{
+			static::$namespaces[$namespace.'_'] = head(static::format($directory));
+		}
 	}
 
 	/**