I'd love to participate...BUT...I have never never never told my weight, and that is a way I have been all my life (well, ever since Doris in 8th grade told everyone what I weighed, and I wasn't even fat.) However, if there was one person who recorded the weights, and could keep a secret, I wouldn't mind.
If you were looking to have it be an incentive for others to join in, then how about...
We divide into two teams. We make it a contest that goes on for 6 weeks. (Then a new round starts up the next six weeks.) One person takes everyone's weight and makes up two teams. The teams should have the same number of people on each, and the toal weight should be roughly the same. BUT, no one knows who's on which team, or rather, you know you're on the "red" team but you don't know who else is with you. Each week scores are posted (the total weight lost in the group). Each day one new exercise "goal" is posted. (ie: walk one mile, do 15 pushups, etc.). Each day one different diet requirement is put up (drink 8 glasses of water, or eat three fruits, eat absolutley nothing with sugar this day, etc.).
This will mean several people have to work this.
One to keep all the weights and record them.
One to come up with a daily exercise goal.
One to come up with a daily diet task.
One to provide some daily inspiration, such as finding success stories or things from the Internet.
(or perhaps the roles can be split up, like one does it Monday and Thursday, another two other days, etc.)
Yes, piccies would be quite interesting, and perhaps someone else could coordinate that as well (pix can be emailed and this person would arrange them in before/after lineups, then publish to the web)
Also, weight can be substituted by measurments for the "contest" bit.
I'm seeing a group effort here that everyone can participate in, compete with each other, but in a non-threatening/sorta fun way. You don't *have* to do the daily things, but it would give everyone a daily goal to keep a focus, establish a routine.
The winning team could then be treated to a hot fudge sunday!