The Washington Post has attempted to comprehensively list all April Fools pranks and hoaxes appearing on the internet today, helpfully separated into categories. There's still April Fools Day on the Web (mentioned twice, previously) which has a collection of jokes, spoofs and parodies around the internet, with annual records going back to 2004. For older records, there's a far from complete Wikipedia list of April Fools' Day Jokes, with a slim selection of notable hoaxes going back to the 1950s, while the Wikipedia article on April Fools' Day goes back much further. Snopes breaks down the legends behind the term (previosuly).
April 1 is the 91st day of the year (92nd in leap years) in the Gregorian calendar. There are 274 days remaining until the end of the year. April 1 is most notable in the Western world for being April Fools' Day. [more inside]
Today by far is my favorite holiday. It's the one day that webmasters get to be creative and do things that normally wouldn't fit with their sites general themes. For example, Google attempts a high tech way of quenching peoples thirsts, Wikipedia sells out to Britannica, a RFC is written on Morality, and much much more!
As a brief distraction from all the death and destruction, let's head over to the museum of hoaxes, where we'll find the top 100 April Fool's day pranks of all time. Good luck with your own respective hoaxing.
This is one of the funniest office pranks I've seen in a while. A few months ago, I proposed filling a coworker's office with ballons, but the packing peanuts are much better (and funnier). [stolen from brig]