Index: wp-includes/post.php
===================================================================
--- wp-includes/post.php	(revision 12937)
+++ wp-includes/post.php	(working copy)
@@ -725,7 +725,7 @@
 		$wp_post_types = array();
 
 	// Args prefixed with an underscore are reserved for internal use.
-	$defaults = array('label' => false, 'publicly_queryable' => null, 'exclude_from_search' => null, '_builtin' => false, '_edit_link' => 'post.php?post=%d', 'capability_type' => 'post', 'hierarchical' => false, 'public' => false, '_show' => false, 'rewrite' => true, 'query_var' => true, 'supports' => array(), 'register_meta_box_cb' => null);
+	$defaults = array('label' => false, 'publicly_queryable' => null, 'exclude_from_search' => null, '_builtin' => false, '_edit_link' => 'post.php?post=%d', 'capability_type' => 'post', 'hierarchical' => false, 'public' => false, '_show' => false, 'rewrite' => true, 'query_var' => true, 'supports' => array(), 'register_meta_box_cb' => null, 'taxonomies' => array() );
 	$args = wp_parse_args($args, $defaults);
 	$args = (object) $args;
 
@@ -789,6 +789,10 @@
 
 	$wp_post_types[$post_type] = $args;
 
+	foreach( $args->taxonomies as $taxonomy ) {
+		register_taxonomy_for_object_type( $taxonomy, $post_type );
+	}
+	
 	return $args;
 }