Index: wp-includes/nav-menu.php
===================================================================
--- wp-includes/nav-menu.php	(revision 13616)
+++ wp-includes/nav-menu.php	(working copy)
@@ -225,6 +225,7 @@
 				$menu_item->description = get_post_meta( $menu_item->ID, 'page-description', true );
 			else
 				$menu_item->description = $menu_item->post_content;
+			$menu_item->description = strip_tags( $menu_item->description );	
 			$menu_item->append = _x('Page', 'menu nav item type');
 			break;
 		case 'category' :