Don't know if this has been suggested yet (haven't bothered reading every post).
But, I would like to see a 'Debate' sub-forum. Simple one on one, or two on two debates, with a moderator (moderating) and selected people capable of voting. (Debates would be structured, and remain archived in the sub-forum.)
I think it would add alot to the forums, and also reduce unneccesary flames and posts being made.