Index: /Users/shawn/Sites/wordpress_trunk/wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 15484)
+++ wp-includes/functions.php	(working copy)
@@ -1005,7 +1005,7 @@
 	if ( is_array( $data ) || is_object( $data ) )
 		return serialize( $data );
 
-	if ( is_serialized( $data ) )
+	if ( !is_serialized( $data ) )
 		return serialize( $data );
 
 	return $data;