Harun Yayli mentions some updates to his memcache.php project (providing statistics on the optimization your site is gaining from using the memcached extension).

Your good comments from all over the world about memcache.php is amazing. Thank you all! I've recently received a contribution from Michael Gauthier. I took the liberty to tweak a bit and now memcache.php can flush individual server (no flush all servers yet).

The latest version of the file can be downloaded here and some sample output can be seen here.