From the Site:

AprilFoolsDayOnTheWeb.com brings you the most complete listing of April Fools’ Day Jokes that Web Sites have run each year from 2004 all the way up to today. Make sure you check out the full list on the (many) pages below, and if you have a site that is not already listed, please add it.
Bookmark this site so you don’t get fooled online this year! Enjoy!

See the List