Not that I've seen many, but Opera Labs' announcement about Face Gestures is the best April Fool's joke I've seen this year, if only for the section on Adult Sites and its reference to facial expressions in the preceding chart. The video's pretty good, too.
Seems there's no April 1 RFC this year. Although the first RFC released this month (RFC5428 on the Standards Track) was incorrectly listed as "April 1" instead of "April" on the New RFC page.
