The paleo diet is awesome. I've lost a considerable amount of weight on it, and feel and look much better.
Also, a diet with staples like grass-fed beef, pastured butter (or any other healthy animal fat), avocado, and fish is my kind of diet. No more forcing down bitter grain or soy products in fruitless attempts to go "healthy". Plus, my meals are so substantial and high in fat that I only need to eat once or twice a day.