there is a little but very promissing group of games that use cards and they are played like board games ... I cannot imaging playing bridge at turn-based site and wait 2 weeks for for my partner to respond, or even fast Gin would be unbearable when time frame for a game would be 30 days or even more than 1 day ... card games have also something more unsuitable for turn-based site ... they are by nature closed games, and players memory plays a crucial role ... so, what you remember now, in just few hours would disappear from your depository and the whole tactic would be useless ... making notes what you are to remember is just boring task and it takes the whole pleasure of playing cards away from the players ...
but card board games offer simple solution to this dilemma ... the best example of thi kind of games is poker itself played as a poker squares, and the other one being cribbage which is even better than poker and can be played on 4x4 or 5x5 grid ...
Below is a link to David Parlett's game called Get Stuck ... please look at the rules ... it's fantastic game and worthy implementation:
http://www.davidparlett.co.uk/oricards/getstuck.html
or the other game, also by David Parlett:
http://www.davidparlett.co.uk/oricards/abstrac.html