From the Museum of Hoaxes comes the Top 100 April Fool's Day Hoaxes of All Time. On the list are such notables as the Swiss Spaghetti Harvest, the Taco Liberty Bell and the year the State of Alabama changed the value of Pi.
Kidzworld has some pretty devious pranks including a forever-on sink sprayer, food coloring in the milk and gummy worms in the fresh fruit in your fridge.
The Prank Institute has quite a collection as well, from a shocking door knob, jello toilets and something with vinegar and baking soda that I probably don't want to know.
Want to know how April Fool's Day got started? Read my little history lesson here.