Back in 2004 I helped out a co-worker on a Machinima movie for the Make Something Unreal contest. The movie was created using the Unreal video game engine and renders in real-time, making for some interesting dynamics (fight scenes are different each time you watch it). We ended up winning first place in the fourth quarter finals and second place in the grand finals.
Or watch on youtube: http://www.youtube.com/watch?v=jnJxzt9jkUU