The only documentation I've seen thus far is the manual on the site.
http://www.vbulletin.com/manual/

I remember you saying you were better at php than perl when we were bouncing around stuff in the active topics add on
I was glad to see you over here and hope you jump on soon so we can get some good hacks

I know squat about PHP, but I understand it's a lot easier than perl.

If I were to design an avatar hack, I would want upload capabilities with size/weight limits in addition to a library of avatars, that way people could make their own or use those already there. Gonna take me a while to get that good, though...