The web is always full of April fools and I'm sure you can find websites that list lots of them.. you probably already came across Google's Mars mission inconjuction with Virgin - Virgle.. you may have also seen the Google can see into the future project. My favourite ones of the days were one from the BBC - based on a documentary about Penguins (if you are a UK users, and within 5 days of this blog) go to [bbc] or take a look at it [aol video] (if you aren't any of these).
The other joke I liked lots came courtesy of Universe Today with its article "NASA to Burn Sponsor Logos into the Surface of Mars" - take a look[here]. 
