I don't play many card games anymore, but once you learn them, you never forget them.

Some of my favs. are/were:

Crazy Rummy
Asshole
Black Jack
Texas Hold Em
31
Socialables (not really a card game, but gets you mad drunk)

And that was about it. We didn't play Poker much though. Rummy and Asshole were some of our favs. though.