Which is the best site focusing on guided imagery?

AAPM. American acadamy of pain magenment (not medicine). This academy is into some of unconventional treatments. However I do feel they are reputable. Look at their site and look for mind-body.
Several. Belleruth naparstek lisw has created a very inclusive site called health journeys (http://www.Healthjourneys.Com/ ) it contains resources for all kinds of conditions and uses. Also dr. Marty rossman (also on healthtap) has a very nice site as well, called "the healing mind" at http://www.Thehealingmind.Org/ enjoy both!
Thehealingmind.org. I am biased towards my own - full disclosure! www.Thehealingmind.Org.