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.
I would normally say card games would not work on a turn based site, but something like gin/gin rummy might just work the more I think about it. 500 points would probable take way too long on a turn based site - maybe to 150 points.