function my_blogs_listing($actions) {
global $current_user;
$blogs = get_blogs_of_user( $current_user->ID );
$actions["#"] = array("*** My Blogs ***", 'edit_dashboard');
foreach ($blogs as $blog) {
$actions["{$blog->siteurl}/wp-admin/"] = array($blog->blogname, 'level_7');
}
return $actions;
}
add_filter('favorite_actions', 'my_blogs_listing');
This code snippet (can be used as a plugin) adds list of blogs that user has access to on MU site. Blogname links to blog’s wp-admin, saving you time.