The forum colours arent brilliant. A lot more work could be done on them as well. Same with the postbit. Check out
vBT to see if you can get some help there.
I also noticed everything seemed to be centered, not really eye-catching. Why not try using some tables? Much more effective IMO.
I think there should be a certain amount of pixel w/h for avatars. Since most of them are rather big.
I have loads more so PM if you want any other problems I found
Otherwise good work