I also think that Bughouse would be a great addition to this site. On this "turn-based" site it should be played probably differently then over-the board and could be played in two forms:

1) As 4 player game (2 player vs. 2 player). Then it can be synchronized as: first players with white pieces make a move (the order doesn't matter), then players with black and so on.

2) As 2-player game, played with 2 boards. Each player plays white on one board and black on another one. Then it would be played in the following order: a) first player makes a move as white on one board; b) second player makes a move on one board as white and on another board as black (he/she can choose in which order, captured pieces are immediately available for dropping on another board); c) then the first player makes moves on both boards etc.