Video

John Wesley Powell - Explorer of the American West
Grand Canyon IMAX Movie trailer
Google Earth Flying in the Grand Canyon
Grand Canyon:  The Hidden Secrets
Vernon Masayesva, Hopi Water Wisdom

Specific Locations
Headwaters of the Colorado River
http://www.youtube.com/watch?v=a-8Y1fiKM3w (amateur video taken at the Continental Divide in 2011)

Audio

Watershed Financing (podcast produced by the EPA in 2007)