I just picked up this video, it's really amazing. They used alot of Bolex h-16 16mm camera's to shoot it, and also alot of DVX footage. It really has some amazing cinematography and innovative filming techniques (300 + foot zip line's, cranes, etc...) I really recommend it to anyone, even if you don't ride mountain bikes...
www.thecollectivefilm.com
www.thecollectivefilm.com