Here’s a fun one just in time for Halloween – Ghosts of the White House – from the official White House Web site.
Watch videos featuring “stories of strange noises in the White House, sightings of President Abraham Lincoln’s ghost and a Halloween prank by President Carter’s daughter.” Also features a transcript from a Halloween 2003 chat with White House Chief Usher, Gary Walters.
Source: Librarians Index to the Internet
Update: Thanks to Kimberly Edwards for letting me know that this link is broken. She suggested this site as an alternative.