I heard Dr Dean say that every diet ever created works, i.e., you lose weight, assuming you follow the diet /forums/images/graemlins/grin.gif. The issue is keeping the weight off. To do this you have to change habits. Exercise habits and eating habits.
I started my diet the week before Thanksgiving and have lost 44 pounds. How? I eat fewer calories than I burn. No diet plan. I use a program on my Palm where I enter the foods I eat and track my calories. It's amazing how many calories you can consume at times other than at traditional meal times. Walk past the candy jar and grab a handful of M and Ms, have a donut in the morning, someone at the office brings in cookies, stand and pick at the lovely Easter ham before you sit down and eat, snack on a bag of chips while watching TV, attend a conference and they supply free cookies in the afternoon, etc. It only takes a few calorie dense snacks and you're over 2,000 calories/day fast.
The program also helps you estimate your resting metabolism rate, i.e., how many calories you burn, based upon your weight, activity level, exercise, etc. Eat fewer calories than you burn, you lose weight. Many of us eat, not because we're hungry, but because it's noon and we eat lunch at noon. We eat a snack at 9:00 PM because that's what we did when we were a kid.
My goal is to hit the weight that will put me at my proper BMI, so I have 6 more pounds to go.