If you're looking for demo reels or commercials or even a short films done in CG, then look no further than CGNetworks.com! Boy do they have some great work. Here's a sample of the work that's available at CGNetworks.com:

Michelle Lam demo reel



Hernandez Nicolas demo reel



Project Mayhem - a.k.a. building battling bipeds



CGNetworks.com - Click on View thread for download links