Been back and forth on a lot of games lately, but here's a sampling of what I've been playing:
PC:
Super Meat Boy (duh)
Minecraft (just got back into it after a long hiatus)
League of Legends (been on and off, but used to be SUPER into it)
Dead Space (caught the Steam sale, which introduced me to this badass game)
Left 4 Dead 2 and TF2 (only really play with friends now, but still fun)
Working on many of the games that the Super Meat Boy extra characters are from, as well.
360:
My gf's been playing a lot of Viva Pinata, which is hilarious.

Halo Reach occasionally
Not much new stuff here, to be honest.
Wii:
Super Mario Galaxy 2 and Donkey Kong Country Returns were christmas gifts, so I'm working on those
iPhone:
Dead Space (amazing prequel game to Dead Space 2)
Chaos Rings (great Square-Enix RPG)
Infinity Blade (the game from the iPhone commercials that runs Unreal Engine and has STUPID graphics)
Fruit Ninja and Plants Vs. Zombies (iPhone staples[*:D])
Grand Theft Auto: Chinatown Wars (FANTASTIC game, if you haven't played it on ANY system)