Suzanne Somers based her Somersizing diet plan on the Schwarzbein plan (Dr. S. was her diet doctor, I believe).
I really liked Somersizing but found it was very difficult to separate out the carbs from the fats -- that plan's basic foundation is food combining. The plan doesn't work well with those who work long hours and have little time for cooking, although Somers' recipes are awesome! Love her cooking style -- got her recipe books and still use them.
Personally, I found I could not do Atkins at all. I got really ill on it. Right now, I'm on the South Beach diet and found it very easy to do! Much less restrictive than Atkins plus it's just saner - a nice combo of protein, carbs and fats for every meal. Lost 10 pounds so far which is a major miracle for me.