Magic, Star Wars (Decipher), Star Trek (Decipher, 1st iteration), Highlander, Babylon 5 (best CCG I've ever played, hands down), Pokemon (sigh), and a game a friend and I made up called 'Frat' (a comedic game about fraternities, with the goal to get your Brothers to sleep with hotter women than your opponent)
Oh, and it's not really a card game, though it's similar: I played MageKnight and Mechwarrior:Age of Destruction.
The Clix system was kinda cool.