Apparently Virgin Blue in Australia offered standee tickets on their discount flights, at 50% off the fare for those who get seats. (And free calf massages.) Alas, the site now just reads "April Fools" and has a link to a real discount.
Google is running a joint venture with Virgin (UK) to create the ultimate off-site backup system:
http://www.google.com/virgle. Google Mail is also offering a service that allows you to backdate email... and have it arrive in time.
Someone got to this year's BBC prank, which approaches the dizzying heights of their 50's "spaghetti harvest" prank.
Turbine's offering the "Battle of Amon-hen" expansion to LOTRO with a new PC race; chickens.
Bungie's tampered with their "Bungie Online" real-time player map to display Mister Chief [http://www.bungie.net/Online/Default.aspx]. I expect this is only the first installment.
More when I find it.
-- Steve loves the creativity shown on this most holy of days.