Something I'd like to see:
An editable OP that can be edited by anyone. This would be very useful for things such as the Humble Bundle thread, X Steam Holiday Sale, threads that are started by people who don't regularly contribute to the thread, etc.
There's one other thing that I wanted to suggest, but now I can't recall what it was. :|
Also, any chance we can update the avatar and signature size (both pixel and kb size)? 100x100 and 500x100 doesn't give much room for creativity.