With any luck, Garrett will have cemurphyfans.com functional by the first. If so, that'll be my primary discussion forum area; I'm not capable of keeping up with high-traffic email lists, but I'm much better at staying with bulletin boards.
The other online forum I'm active on is the Luna boards, where I'll have a thread of my own starting in June.
So, once more, announcements-only mailing list here, cemurphyfans.com here, and Luna boards here. :)