OK, I've got another cool site for you. Anyone looking to lose weight should take a look at PEERTrainer. It's a free social networking site designed to offer you support and encouragement while dieting.

So after you've added some music files to your MySpace account and loaded pictures on your Friendster profile, is it possible you'll exchage diet tips on a weight-loss network? PeerTrainer, created by husband and wife Jacqueline and Habib Wicks, is an online tool that places groups of dieters into support networks and lets them interact and track one another's weight-loss progress.

The founders say the goal is to allow its subscribers to create a weight-loss information aggregator so they can help one another with diet and exercise suggestions along with offering good, old-fashioned encouragement.

The site's About page explains the general idea:

The core idea behind PEERtrainer is that most people know how to lose weight and get fit but have a hard time following through. A free, lightweight program that you use with either friends or anonymously can be very effective.
It's relatively simple. You create or join a group with up to three others. You log your goals, meals and workouts, and the other group members do the same.
Each member comments and keeps each other accountable and motivated. What happens is interesting -- when you write down your goals, meals and workouts, and then have to post it to a small group of people, it changes your behavior over time.
You begin to think about your choices a bit more than you otherwise would. When you change your behavior, you lose weight and meet your fitness goals.
PEERtrainer has grown into a highly knowledgable community that harnesses peer pressure to meet individual goals. Our patent-pending approach is new to the fitness and weight loss market but uses concepts that are proven to work.

The founders say they'll monetize it with premium content later. I noticed they are already running a few affiliate ads.
Visit their site at PEERTrainer.com