i watched this the other day myself. geekologie had it posted as one of their articles. they also had a fan short for fallout 3 which was really good.
http://www.geekologie.com/2011/01/video_game_fanfilm_mania_impre.php (www.geekologie.com)

Interestingly, and I give a lot of credit to not only youtube, but to the availability of affordable HD digital camcorders, fan made trailers are close to being on par with the SFX of hollywood, no?

proof in point - one of my favorite youtube artists doing some great low budget shorts: freddiew2

http://www.youtube.com/user/freddiew2 (www.youtube.com)