Here is a web resource for information on U.S. Presidents:
American President: An Online Reference Resource Collection of material about U.S. presidents, including "essays about each President and their lives before, during, and after their presidential terms. It additionally provides information about the First Lady and cabinet officials of each administration." From the Miller Center of Public Affairs at the University of Virginia.
http://www.millercenter.virginia.edu/academic/americanpresident/
