I just found out about the "Demoscene" recently, and I'm completely in love with the idea.

The goal is to make a short video from 5 to 10 minutes, comprised of imaginative computer graphics and electronic music. The video is supposed to be an example of everything that you can do as an artist, showcasing the full extent of your abilities.

Here's an example...

[youtube:yul3hpe8]http://www.youtube.com/watch?v=k_oTQd93eRI&feature=related[/youtube:yul3hpe8]