From what I have been reading the Co-ops seem to be nothing more than another form of a big business getting insurance for a group, even if a non-profit, they have to make money to keep the co-op running and pay the board and president, etc. They in turn just go to regular insurance companies and get insurance for their members, hopefully at a lower price. The down side is that without real insurance reform you just put another layer between you and the doctor.
http://patients.about.com/od/healthc...rancecoops.htm
NPR had a good interview about them today with people representing both sides. I can't get the link to work.