http://www.museumofhoaxes.com/aprilfool2.html

Some quality ones listed, including the ever favourite Swiss Spaghetti BBC hoax.

Plus this little beauty from the BBC (apparently real)...
http://news.bbc.co.uk/2/hi/uk_news/3588465.stm

I know a lot of people who belong in one of these!

http://www.satirewire.com/features/siliconpines/acf.shtml

For family members, it is often the most difficult and painful decision they will face: to accept that a loved one — a parent, a spouse, perhaps a sibling — is technologically impaired and should no longer be allowed to live independently, or come near a computer or electronic device without direct supervision. The time has come to place that loved one into the care of an Assisted Computing Facility. But you have questions. So many questions. We at Silicon Pines want to help.

http://www.darrenbarefoot.com/hall/

Quite amusing stuff. Kind of like Engrish and other sites poking fun at odd or inexplicable pictures/signs/etc.