I joined http://www.sparkpeople.com in April which is a free site and has all sorts of people doing all sorts of things (exercise, eating differently and having to work around/with kids, hobbies, health problems, other interests). But it's great for having buddies and people who like the same sorts of things as you do to help motivate; that's its best feature in my opinion, the motivation. I just kind of naturally got into thinking differently and trying different things.