A friend of mine went to DivorceCare, which I believe is readily available on the East coast. She raved about how helpful it was. The groups are facilitated by a leader, and they even have DivorceCare4Kids (I think that's what it's called).

She was so enthusiastic about it that I'd really hoped to be able to find one in my area, but unfortunately no luck. You could probably Google it and find a location near you.

Good luck!