My mum mentioned an idea about thinking about the Atkins diet a while ago, and I talked her out of it. I don't know all the details of it, but I know that I've read about side-effects and possible health problems as a result of it. I think most diets, such as Atkins, are fads. They may work in the short term, but most people say that the weight returns very quickly, and it's not a diet you may want to stick with. It's not balanced.
I don't need to lose weight myself, but a while ago there was a feature on the UK TV show This Morning about diets. They made a good point about these diets, and how you should think more about eating healthily and a balanced diet (not cutting out a whole food group, like carbohydrates, which I believe are important for energy), not to mention getting extra exercise - e.g. walking somewhere instead of driving, getting off the bus a stop early and walking the rest of the way, taking an exercise class etc. There was also an interesting method of eating properly:
Eat when you're hungry - whether it's mealtime or a snack. IMO, you shouldn't feel guilty about eating things you like sometimes. As they say, a little of what you fancy does you good.) Listen to your body.
Chew your food slowly and enjoy it, don't just shovell it down.
When you feel full, stop. Don't think that you have to finish what's on your plate just because you've cooked it - if you're full, just finish the meal. (Eventually, you'll probably start giving yourself slightly smaller portions as a result of stopping when you're full rather than carrying on just to finish what's on your plate.) "Eat less, move more."
Apart from that, IMO it's just important to eat a healthy and balanced diet and to get exercise and work your body.