Loads
Crysis 2, loved the original and warhead, finished them both several times, got right and far into crysis 2, got a new rig and just completely lost interest.
Skyrim - About 14 hours in, still jump on it a few nights, the world is massive and will keep me going a right while, very easy to get sidetracked with other quests
Just cause 2 - dont have it installed no more, probably be worth a run again, but can't see that happening
Deus Ex Human revolution, about 8 hours in, do plan on playing more of it, just a matter when
Metro 2033 - Liking this one, playing it more often than the others.
Batman arkham city - finished the main quest but i want to go back, cause i missed a lot of side missions