RvB Blood Gulch Chronicles
Red vs Blue: The Blood Gulch Chronicles 
I saw these a while back but didn't bother to watch the movies, but last night I saw a favourable post about them on Boing Boing and decided it was about time. :-)
Having played a lot of Halo, esp. in four-player deathmatch mode, makes these even sweeter. Hilarious stuff. I can't wait for the next episode!