After AMV here we have Machinima (rhymes with cinema). Machinima are films made using simple 3D games packages, like Unreal, Halo etc. Motion is captured by moving the characters in the game, and the voice track then overdubbed.
I've looked at doing something similar with Alpha Worlds. Oh well, maybe get round to it some time.
Good Machinima resources are:
Apparently the Red vs Blue stuff is very good. There is of course a G2 article on the topic.
***Imported from old blog***