Our forum is up and running here: http://www.enworld.org/forum/living-4th-edition. Come by and join us!
Is this forum still running? I don't see a post dated later than October 14th. If the forum is still running, I would love to be part of an effort to build a 4E campaign setting.
Yes, this project is very much active. We run it in a forum, though, not directly in this discussion group. Click here to see where all the action is.