Elephants Dream (wikipedia) is a computer-generated short film made primarily using open source applications and premiered on 24 March 2006.
So whats so great about this short film?
1. It was developed using opensource programs including GIMP, Blender and Inkscape.
2. Its 3D. Graphics are impressive.
3. Its FREE! Released under Creative Commons Attribution license.
So? Go get it on bittorent.