We've got a Yahoo Group set up called DFWAtheistTalk.
Click here to check it out.
Click "Join This Group" and you can read and post messages with us. WARNING: It's filled with all kinds of jibber-jabber about this and that. You see, we're all friends. And we just kind of talk about whatever. We'd love for you to join us.
Once you've joined, you can click "Edit Membership" to change your subscription settings.
We're looking into setting up a dedicated forum, but for now, this is what we use.