Probably the best April Fool's I've seen this year was on the Guardian website, announcing that all their news stories would be published solely via twitter from now on.  This of course would restrict all news articles to 140 characters.

A mammoth project is also under way to rewrite the whole of the newspaper's archive, stretching back to 1821, in the form of tweets. Major stories already completed include "1832 Reform Act gives voting rights to one in five adult males yay!!!"; "OMG Hitler invades Poland, allies declare war see tinyurl.com/b5×6e for more"; and "JFK assassin8d @ Dallas, def. heard second gunshot from grassy knoll WTF?"

Good work and well put together by 'Rio Palof'.