Right now I'm a busy college student, so I don't play a whole lot of games, but here are the ones I do:
Dungeons and Dragons Online MMORPG (now free!)
Ancient Domains of Mystery rogue-like
Samurai Ninja MMORPG strategy game


As a Computer Science student, I do get to write some games though. By far, the best one I have is Exalted War. I have a few other ones, and I'll put them up when I get the chance.