There is a nice interview with medical historian Anne Harrington in Salon today (by Katharine Mieszkowski). She is chair and professor of the History of Science at Harvard, and has a new book out titled "The Cure Within: A History of Mind-Body Medicine" (reviewed by the NY Times here). It sounds to me that she may be going a little too easy on people who promote the notion that we can heal ourselves with our minds, but she seems more interested in where the notion came from than whether it is right or not. It's easy to tell from the interview though, that she does not think the data holds up for most of these notions.
Sounds like it could be a good read, and I might have to check it out.