I must say that I had very good results with the calculator that Glenn posted. That one takes into account your height and current weight, as well as your age, rather than just a simple formula applied to everyone. I also like the idea behind zig-zagging calories and have used that since January with good results.
Keep in mind that all of the calculations you use should pass a "common sense" test. For example, I am on the short side and close to my goal weight...and the "7X your body weight" calculation has me eating 805 calories a day; that's just ridiculous. Jillian's workouts kick my butt and produce results, but I'll leave that piece of her advice alone.
It's all about personalizing it for yourself.
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Cassie
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days 
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