Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
Nothingness: Very similar to loop chess, but your partner gets the pieces you capture. It would be fairly easy to implement (I think). Each game could go on independant of each other. You would need to be able to see your partner's game.