If you know of something which is easy to set up, easy to administer, easy to use and provides better handling of multi-way threaded discussion, I'd be interest

If you know of something which is easy to set up, easy to administer, easy to use and provides better handling of multi-way threaded discussion, I'd be interested to hear about it. (I know Python is experimenting with a forum-based solution, but I worry about the burden of both yet another account to create and site to check, and finding people to maintain and moderate it)