American Academy of Religion 
Learned society and professional association for scholars whose object of study is religion.
http://www.aarweb.org/H-AmRel: American Religious History 
H-Net group dedicated to the scholarly discussion of religion in American society from pre-colonial times to present. Features subject overview, archive, reviews, links to related resources, and subscription information.
http://www.h-net.org/~amrel/
Directory of Religious Centers 
Directory of non-Christian and non-Jewish religious centers in the United States, including Buddhist, Hindu, Jain, Zoroastrian, Bahai, Pagan, Islamic, Tao centers and temples.
http://www.pluralism.org/directory/
American Atheists 
Organisation working for the civil rights of atheists, promoting separation of state and church, and providing information about atheism. Includes essays and articles, and links to related local and international organisations.
http://www.atheists.org/