Go to about.com for the Basics of Atheism & Agnosticism.
A Candid Word published "Persecution Today: Atheists Are the New Jews" in November 2008.
Little Book of Atheist Spirituality by Andre Comte, translated by Nancy Huston (New York: Penguin, 2008) will give you a nice sense of what many atheists do believe in.
Atheist Centre of the International Humanist and Ethical Union is committed to promoting Positive Atheism (per second definition on Fact Sheet) worldwide, especially in India.
Explore the relationship between Unitarian Universalism and Atheism by visiting Nexus, a UU Atheist Website. Faith of an Atheist is a sermon by Rev. Darcey Laine and Why Atheists Go to Church is another by Reverend Matt Tittle.
The Tennessee Encyclopedia of History and Culture has a short, interesting article on the utopian, free slave colony of Nashoba started by Frances Wright.