I came across this post from Andrew Clapper during my morning reading. It looks like Clapper is proposing another organization dedicated to Atheism. He has an interesting premise.
The organization (tentatively called the International Society of Atheists) will focus on a set of clear goals: to establish social and support networks for atheists on a local level, to serve both local atheist communities and local communities at large, to reach out to individuals and groups such as public officials, the religious community, and other atheist and service oriented organizations, and to eliminate negative stereotypes about atheism and atheists. The organization will also pursue some not so unique goals that are nevertheless important to atheists, such as the promotion of separation of church and state, reason, and civil rights of atheists.
I like the emphasis on service. I do not see that as a mission in most of the other Atheist oriented organizations.