Peter Masters just released his book about erotic hypnosis (Look Into My Eyes) as a free pdf download. For those of you who haven't read this book, now's the chance. It's the most comprehensive book on the subject that I've read.
You can get the pdf here:
[url]http://www.peter-masters.com/look_into_my_eyes/look_into_my_eyes.pdf[/url]
You can find more information about the author here:
[url]http://www.peter-masters.com/[/url]
He also has a book about D/s relationships (The Control Book). I've read that as well, it's worth a read if you can track down a copy.
Edit: fixed a link