Best April Fool's: WordPattrn

Dom Bettinelli had a good one (and I'm still trying to figure out if this is one - at this point, don't think so). Lots of others. But this is the best:

WordPress and Textpattern have merged!

Dean Allen, creator of Textpattern, and Matthew Mullenweg, founder of WordPress, have signed a historic agreement to merge the two failed projects into a new weblog application named WordPattern.

Important Update, 3pm
WordPattern has been acquired by Flickr, and is now known as WordPattrn.

Important Update, 4pm
WordPattrn has been acquired by Yahoo!, and has changed its name to WordPattrn!.

Vision:
Our groundbreaking, no-nonsense approach of creating a fast and lean CMSMS (CMS management system) is unparalleled and will fulfill the need of every user out there – we won’t be content with anything less.