I've been doing South Beach for the last 3 1/2 months (my DH has been doing it with me too!) and we LOVE this diet. We actually don't feel like we're on a diet, it's definitely a way of eating, and a change we want to follow for the rest of our lives.
We like South Beach because there's no weighing, measuring, counting points, etc. Either you can eat it, and you eat (within reason) as much as it takes for you to not feel hungry, or you can't eat it. It's a very well-balanced diet, my own doctor recommends it.
I've lost almost 30 pounds so far (and that includes a few vacations and a trip to Disney World), and my DH has lost over 30 pounds.
There's a South Beach diet thread here somewhere, I'll try and find it!