andreas: I like this game on live really much. I think communication with the players is really important. That's why this game could be maybe played only with two players?(One players controls both boards). It would make it faster and easier.
Fencer: Oops, I forgot that Bughouse was discussed here too. Do you really intend to use the synchronous version of bughouse (I don't think that it is popular at all, but it may not be that bad), or the standard version where you can play on either board at either time ? If playable, the latter would probably generate a lot of traffic, as some lost seconds can lose the game :-)