I found this website today.
It's actually pretty much what I've been looking for, for quite some time. You can put everything on it. Weight, body measurements, what you eat, what workouts you've done. There are groups to join. Lose 5 pounds, Ride 100 miles, walk the AT, run a marathon...etc, etc.
There are forums and you can gain GymBuddies. People who provide support and motivation (and you can supply motivation to them) via the site.