Let's see...
Call of Cthulhu: Haven't played it since the mid-90's when I was in high school. We never did the creepy, really, but we did do the go-crazy and stay alive as long as you can type one-shots. Immensely fun!
Mechwarrior: Played both the 2nd and 3rd editions a bit, but we had issues keeping campaigns going. Still, a lot of fun and I love the universe, which I'd love to explore again.
Shadowrun: My favorite game that I don't really get to play anymore. At most, I get to play when I go up to Boston and run a game for my friends there, maybe once or twice a year, plus a bit when I go back home for visits, plus I'll probably continue to run a game at the MD-DC-VA Game Days. These occasional nibbles make me miss it even more, I imagine.