Currently playing:
Borderlands 2 (Have the major DLC to play through and then maybe the last 30 minutes or so of the main quest)
Far Cry 3 (Just started this on Tuesday, so pretty much the entire game to go yet lol)
Dwarf Fortress (The game that's been sucking up more of my time than I should probably give it. It's like crack)
Backlog (Well, the major games at least):
The Bioshock series (Started 1 like 3 times, never finished. Never played 2 or Infinite yet.)
Dark Souls (Got frustrated with it. Will finish one of these days.)
Darksiders (Started it, lost interest. Will probably pick it back up at some point after finishing Borderlands or Far Cry)
Dishonored (Same as above.)
L.A. Noire (Looked better in the Youtube videos than it actually is IRL. Plus I'm terrible at the game. Will most likely never finish.)
Mass Effect 1 &2 (Same as Darksiders.)
Psychonauts (I remember having some technical problems with the game I never figured out. Another game I really should play more of, but most likely will never finish.)
Star Wars KOTOR (Great game. No idea why I lost interest in finishing it. Will definitely pick it back up before I die, hopefully.)
The Witcher series (Stopped playing the first one due to Skyrim. Never played 2 yet. Will finish both games eventually.)
I have several more minor games to give some proper time to as well. (Bastion, Hotline Miami, To The Moon, a few more.)
Edit: Forgot about Baldur's Gate and Baldur's Gate II on my phone. Need to finish them up sometime before I die as well.