Have you seen my list of mailing lists?
<http://www.lucifer.com/~sasha/lists.html>
I tried to create a comprehensive directory of good lists, hoping that more people cross-subscribe to them and help carry good memes around faster - an early memetic engineering effort of mine, can't tell how well it worked. But it's a good list.
Let me know if you want me to add, remove, or annotate any entries there.