I’ve always been a fan of discussion on mailing lists - I much prefer them to these new fangled web-based forums.
What are your favourites? I guess I’m looking for those that may not be that well known, but which have good discussion about topics that interest Lobsters users.
To get the ball rolling, here are a few of mine:
Update: I’m thinking more of discussion mailing lists (see my favourites), not newsletters, but the latter are useful to share too.