I'd like to see a forum category called "Activism" or "Action Alerts" that could be used for members to post material on which others could take action (e.g., voting in polls, writing letters to the editor or elected officials, etc.). Seems like it could be useful.
I think the home page should include the Atheist Blogroll. Perhaps underneath the "Our Friends" section. You can see it in action on several atheist blogs, here it is on mine (I swear this isn't a shameless plug) http://axisofjared.blogspot.com/