The Telegraph has published a handy roundup of today's action here, and also a handy Top Ten of previous April Fools, including the granddaddy of them all, Panorama's report on the Spaghetti Trees of Switzerland.
But the BBC has scooped them all with this. I think it may be a legitimate advert for the iPlayer service, but someone with an evil mind down there in Shepherd's Bush decided to release it via the News today. If you haven't already seen this, settle back, take off your shoes, wiggle your toes, and enjoy.