In the recent issue of 3D World magazine, they have an article listing the 100 CG shorts you must see. Here are just a few from their list:
#91) "Pixels" (2010) by Patrick Jean
PIXELS by Patrick Jean from ONE MORE PRODUCTION on Vimeo.
#52) "Azureus Rising (2010) by David Weinstein ...and one of my personal favorites
AZUREUS RISING from David Weinstein on Vimeo.
#36) "Fallen Art" (2004) by Tomek Baginski
Fallen Art from short clips on Vimeo.
#24) "Alma" (2009) by Rodrigo Blaas - I heard recently that this short is being extended into a feature film project.
Alma from Rodrigo Blaas on Vimeo.
#61) "Oktapodi" (2007) by Gobelins L'Ecole de L'Image - In one of my classes at Animation Mentor, we analyzed this film practically frame by frame. It was quite interesting to really study a film like that.
Oktapodi from oscardodo on Vimeo.