I just Googled 'hypnosis' (don't ask me why, I just randomly Google stuff sometimes to see what's out there) and came upon one of the best descriptions of hypnosis I've seen yet on The Dilbert Blog. Go figure.
Not only did Scott Adams do a fine job of explaining hypnosis, but he started off by mentioning that his mother used hypnosis for birth and felt no discomfort!
Then, about 2/3 of the way down, Dudeman posted about how his wife 3rd birth, which should have been more difficult as a posterior presentation, was so quick and easy they almost didn't make it to the hospital. About 3/4 of the way down, a post under Brain Blank, written by his wife, tells of a birth using HypnoBirthing(R) that was also pain-free. Cool!