White House
Official Site of the White House, it has information about the President, Vice President, and First Lady. There is also information about the White House itself and a news archive going back to 2001. There are also some statistics available here too. Also some brief biographies of past presidents are available here too.
American President.org
This has a good collection of resources for the presidents, with descriptions and ratings of the pages. High school teachers evaluate some of these websites. Also it includes sections on domestic affairs and foreign affairs for each president. This page is a bit more detailed than the page from the Internet Public Library.
Presidentsusa Net
Site claims to be the most comprehensive site for Presidential Resources on the Internet. There are several categories of links including Inauguration, veto record, and military service. A group called Presidential Research Services sponsors it but there is not any information on this page about the organization.