Here are some of the most popular diets today. I added links to reviews of them if you like:
Fat Loss 4 Idiots
Top Secret Fat Loss Secret
Turbulence Training
Each of them is widely different
You can also check out a review of all of them on this webpage:
How To Lose 10 Pounds
I hope this helped. There are a lot more diets out there, some good some bad, but it seemed this guy knows what he's talking about