p90x works well

Honestly, hard work. It's all it is. Eat well, drink water and exercise. You can take some supplements along the way, but in all honesty most programs are just gimmicks.

ZUMBA! But remember that no matter the workout program, the eating is really where it counts! Carbs, alcohol, and sugary drinks like pop and juice are HORRIBLE for you! I know that cuts out a lot, but trust me! Eat meats, veggies, and fruits!

yes P90X all the way! also i hear insanity is great.
beachbody.com

Low calorie meals are the only weight loss gaurentee. Low calorie, Low weights, High reps.
Plenty of cardio, Personally I used a appitite suppresant to stop me eating so much.
Good Luck.