I use his weight loss book and CD. The book and CD are called 'I can make you thin' and I bought them quite cheap on Ebay. While I haven't magically shed all my excess weight after using them I have lost a couple of kilos. The important thing to remember is that hypnosis isn't a magic wand. It won't do the exercise and dieting for you! It can effectively reprogram your attitudes toward healthy eating and exercise, but it doesn't eliminate the need for eating better and exercising more.
I think it's also great for healing a poor self body image. Part of the hypnosis CD concentrates on visualising yourself as thin and healthy and feeling how that would feel. I'm finding that by listening to the CD regularly you can't help but feel more positive about yourself.
That was a great article you linked to. I'd be interested in seeing the TV show they were talking about.