April Fools!

Seeing as it was that time of the year yesterday, some April Fools hoaxes...

This google one is quite funny, if you read through it all. A fair few computer related in-jokes though. http://www.google.com/jobs/lunar_job.html

This was also released on April 1, but I think it's real (I've signed up for it anyway, for when / if it comes out):
https://gmail.google.com/

Here is an older one from a previous April Fools day about their search technology "pigeonrank": http://www.google.com/technology/pigeonrank.html

This one is also moderately funny (and moderately painful), but again, computer related in-jokes abound. Similarly to the google joke, a fair bit of work would have gone into it.
Dating Design Patterns book review *Update* -- it's been pointed out that this is a real book, not a hoax. I think this only makes it even funnier.

Here is a list of the top 100 April Fools hoaxes, including one by Dick Smith, seemingly towing an Antarctic iceberg into Sydney Harbour. Apparently he'd been going on about it being a good idea.
http://www.museumofhoaxes.com/aprilfool2.html

Here's a funny one about a Web standards protest march:
http://hownow.brownpau.com/misc/m4west.html

Finally heres a list of most of the web based April Fools hoaxes this year (and last):
http://www.waxy.org/archive/2004/04/01/internet.shtml