I put together a video of the entire ascent via the Avalanche Gulch Route. If you want to see what the entire climb and incredible descent are like--you'll like this video:
http://www.walkifornia.com/2012/03/mount-shasta-via-famous-avalanche-gulch.html

Best of luck on the climb. It is my favorite summit in California by a long shot. Mt. Whitney is just another high point compared to the SUMMIT OF SHASTA.