I saw this thread, did a bit of research and decided to buy the book. I bought it this morning and finished it by lunch, as it's quite short, but it seems to have a very different approach to weight loss. Although I obviously haven't had experience with it yet I can say that it explains alot about why using diets doesn't work and it's worth the price alone just for the read - not that it's expensive anyway.
He has a youtube video on his site where he talks about the concept of mental obesity. Interestingly, the analogy he uses to describe mental obesity is very similar to the metaphor that Erin recently recieved from her guides, except it was bird and not a fly that was trapped:
YouTube - Mental Obesity- The Gabriel Method