Smartisoft published the PHP/mySQL guestbook phpbook. Unfortunately, their version 2.0 can not run if php globals are turned off.
Update 6-11-2007: Unfortunately this guestbook is outdated and due to security reasons no longer safe to use. Please use a modern alternative!
When my hosting provider turned the php globals off for security reasons, the phpbook didn’t work anymore. I decided to update the phpbook code in a way that it would work again. And here it is! phpGloBook, available under GNU Public Licence (GPL).
Download phpGloBook 1.0 here:
Or view the demo first.