Cooperative Digital Resources Initiative (CDRI) of ATLA and the Association of Theological Schools is a repository of digital resources contributed by member libraries. Includes lithographs, sermons, shape-note tune books, manuscripts, and images of Christian art and iconography. Also manuscripts and texts.
The Pew Forum conducts surveys, demographic analyses and other social science research on important aspects of religion and public life in the U.S. and around the world. It also provides a neutral venue for discussions of timely issues through roundtables and briefings.
An online exhibit from the Library of Congress about the role religion played in the shaping of early American life and in forming the American republic.
Offers statistical data on more than 9,000 Christian denominations around the world, as well other major world religions. Free membership offers limited access to data.
Christianity: The First 3000 Years by 
Christianity and Contemporary Politics by 
Christianity and Human Rights by