Recently I've been trying to fit in a match of TF2 when I can, just because, haha.
@Manuel: I highly recommend playing it if one has a PS3. It's a fantastic game. If you have either a PS3 or 360 though, Dark Souls, its spiritual successor, is coming out on Oct. 4 so I'd wait for that. It looks really promising, and is said to be 'even harder'. :]
@Luyren: I gotta say that even if you're level grinding it's still kind of fun because if you get complacent, the game won't forgive you, haha. Of course, New Game+ is a lot harder. Some call it the 'true Demon's Souls'.
@Blob: Oh man, Paper Mario 2. Awesome bro. You got Disgaea 4 too? Neat, I heard it's the best in the series yet.