Honestly, I think the best way to "diet" is to not "diet" at all. If you really want to lose the extra pounds, get into shape, etc., then your best bet is to make lifestyle changes.
I constantly hear about people who went on "such and such" diet, and lost a ton of weight. As soon as they reached their goals, they went right back to eating the crap they were before and gained all, if not more, of the weight back.
Lifestyle changes are the answer. Make commitments to gradually improve yourself. Don't try to change everything at once. Start small, and let a new lifestyle change become a habit. It isn't going to happen over night, so be patient.