Index: wp-includes/meta.php
===================================================================
--- wp-includes/meta.php	(revision 15490)
+++ wp-includes/meta.php	(working copy)
@@ -53,6 +53,8 @@
 	$_meta_value = $meta_value;
 	$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
 
+	do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value );
+	
 	$wpdb->insert( $table, array(
 		$column => $object_id,
 		'meta_key' => $meta_key,
@@ -190,6 +192,9 @@
 	if ( !count( $meta_ids ) )
 		return false;
 
+	
+	do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $meta_value );
+
 	$query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )";
 
 	$count = $wpdb->query($query);