Philosophy, Reality, and Humanism - join
Contemporary and Classic reality-based philosophy discussion. Evolutionary biology is good for this area; stoned hippie or religious opinion is not. Secular Humanism is worth bonus points.
Low activity, 110 members

talk.atheism - join
Debate about the validity and nature of atheism.
High activity, 532 subscribers, Usenet

alt.atheism - join
Godless heathens.
High activity, 2747 subscribers, Usenet