I love Mark Sisson's style and appoach. Have been following it for about five weeks, and lose an average of two pounds of fat a week while still building muscle without supplements or a hell of a lot of exercise. My energy levels are great now that I control my insulin and derive most of my caloric intake from fat.
If you like Sisson, check out Robb Wolf of the Paleo Diet and his podcasts. Arthur Devany is also a great resource for his Evolutionary Diet.