Well, I don't post about animation much, but here's one more...
Some of my old co-workers are at a swell company called Valve now, and they made this neato little trailer for their new game. I like the mixture of casual guitar-playing and ultra-violence.
p.s. I hear that video doesn't play for some people, so you can choose another version of it (called "The Engineer") to the right on that page.