Sure, I'm in. I've never heard of mental poker before, but it certainly looks like a fun problem... much trickier than I first thought. So let me see if I understand: in a properly shuffled deck, each player would hold a commutative encryption key for each and every card in the deck.  So to 'unlock' a particular card, a player would need to request keys from all of the other players in the game. Do I understand correctly? My first thoughts are:

* Brilliant
* Lag and disconnects could be a problem. Suppose Alice, Bob, and Carol are playing a game and Bob suddenly decides to disconnect because he would rather pick lint out of his belly button. How are Alice and Carol supposed to finish the game without Bob's keys?
* There could be workarounds, but right now I don't know what they are.
* Something must be done. Rampant cheating in the online poker world is killing the game, which is a shame. Let's put our heads together and see what we can do.