Guestbook
This is a great php guestbook that supports many admin functions including deleting, banning IP's, promoting people to admins, a counter, a counter of how many people since your last visit, different kinds of posts (all bold, rules/important (go at top), and of course regular, only regular is avaible to the commen user), user freindly BB code, how many people viewing guestbook, and of course smilies. This runs strictly on php and requires no mySQL or any other language.