See the Elephants Dream web site.

This is kind of cool – a 3D animation created completely with open source tools. They've even included the production files for everyone to examine. The download is 99MB at it's smallest resolution, or up to 450MB in other formats.  They say it's playable under mplayer, so I'm downloading to verify that.  You can buy DVDs of the project too to help support future projects.  I guess interest in that idea will depend on how well this movie came out.
This sounds like a fun project to examine more closely.  As if I have time to add more projects to my TODO list….