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.
Dogod: They use that system over at dailygammon.com. I like it for the most part. The only detractions is that you often have to be online for a longer period of time to make a set of moves in a game.