I'm trying to pry myself away from the TV these days, so I got a stack of books from the library. Two good ones are "Thin for Life," and "Eating Thin for Life" by Anne M. Fletcher, M.S.,R.D. These contain the compiled secrets of losing weight and keeping it off of people who have done it successfully. No rocket science here, just common sense approaches that are proven to work.
It boils down to good food choices, behavior modification, exercise, and all that boring stuff we know about already. To put it very simply, these folks decided that they wanted to get down to and keep a good healthy weight more than they wanted to eat junk food. They still get their treats, of course, just in moderation, and they incorporated cooking tricks to lessen calorie and fat content.
It's a constant battle, so we need all the education we can get. These books are easy reads, so they won't take you long to get through them.