I've put together 14 high-quality original podsafe instrumental tunes from my Penmachine Podcast into a CD album you can buy. It also includes a bonus data DVD with a bunch of cool stuff that isn't on this website. Find out more...
Wikipedia's huge list of 2006 April Fool's pranks is informative, but it's so dry that it takes most of the fun out of the items by explaining them to death. Maybe just follow the links when they still work.
Since I've been working with WordPress lately, I found the WordPattern hoax funny, mostly because of the changes over the day: "We've been bought by Flickr and now we're WordPattrn," "Oh wait, we've been bought by Yahoo!, so now we're WordPattrn!"
Yes, very in-joke, but I'm in there, so it was funny.