Really good. I would only suggest some stuff:
SFGHQ Night as the defauld skin, while the custom one isn't ready.
Avatars and signature images allowed. I think that instead of blocking the signature images, there should be a user setting to disable them. I don't care with huge sigs (Ok... only if they are REALLY huge), but it's fair to give who cares the option to disable them. Anyway, if they are enourmous, users with sigs on can adblock them.
The reply box is not skinned (I don't know if this can be fixed easily.)
The valid file extensions should include RAR, GMD, GM6, CCA and GAM. And could include WAV, MID(I), OGG and MP3(Not sure about this last one... if it would encourage piracy or something.) Maybe not filetype restrictions at all.
Better/More emoticons. If you guys want, i can work on some custom ones right now.
BTW, thanks again for who donated.