Suggestions

Here are my suggestions for Advanced guestbook and advanced poll:

More users support: I noticed you sort of have this already but I have to go through phpMyAdmin in order to manager users. I would like a built in way to do this. I would also request that users may only edit their own posts and possibly for the include statements, a way to only show polls from certain users. With your changing username feature, it is kind of essential for me that you make the script makes sure that the username is not taken first!

Guestbook comments take administrator usernames and passwords instead of poll comment password.

Adding these things would be greatly appreciated.