Another regular contributor to Outdoor Photographer, Galen Rowell offers a number of great articles and images for inspiration and instruction in Mountain Light: In Search of the Dynamic Landscape.
Galen also has produced a great video on Mountain Light, discussing things like the best time to shoot, scouting out a shoot, and how film "sees" very different from how the eye sees. If you can't find the video at your local library or rental video shop, buy the book-they are both excellent. In the meantime, we will keep trying to find an online source for the video. Also, be sure to visit Galen's very cool Web site. There he offers, among other things, a couple of fun videos put together with another great wildlife photographer, Frans Lanting, who you may know by now (he is featured at the top of this page).