Here is a great idea for a modder to make, a chess game where there can be tournaments and such. Also can be incorporated with vbbux/ucash to maybe earn some winnings.
Or if they wanna do more, they could do checkers too, and backgammon, and all them.
Yeah the only thing with that one is, it is not as great as if you were actually on a chess board, like yahoo online multiplayer chess. That would be something fantastic if it was built off vbulletin.