Ghosts of the White House
Here's a fun one just in time for Halloween - Ghosts of the White House - from the official White House Web site.
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Update: Thanks to Kimberly Edwards for letting me know that this link is broken. She suggested this site as an alternative.
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
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Update: Thanks to Kimberly Edwards for letting me know that this link is broken. She suggested this site as an alternative.