5 links
April Fools Practical Jokes Gag Gifts
april-fools.us
Contains a list of pranks from 1990 to present day. Also includes ideas for gag pranks.
Microsoft Buys the Open Directory -- or Not
pandia.com
Information about 2002 "acquisition" of the ODP by Microsoft. Includes a screen shot of what the main web page looked like.
The Top 100 April Fool's Day Hoaxes of All Time
museumofhoaxes.com
An illustrated list, by Alex Boese.