Machinima; by request, here's some machinima links. Machinima is/are movies made using game-engines. It's apparently a thriving field and I expect it will only grow as game engines and scripting interfaces improve. Love how those wacky kids mess with technology.

Using Halo: http://www.redvsblue.com/home.php
Using the Sims: http://strangerhood.com/home.php
Using Anachronox: http://www.machinima.com/article.php?article=322

http://www.machinima.com/
http://www.planethalflife.com/vision/tutorials/movie_types.htm