I'll be updating this periodically with pranks I see today. I feel most will be online.
1. Google announced a new project called Virgle Pioneer. It's a Virgin/Google partnership about starting a mars colony in six years.
2. Gmail custom time. Set the time the email was sent as well as the read/unread status.
3. Youtube has changed every single video link on the front page to be a Rick Roller link. (best so far)
4. Woot is having a fake woot-off where each and every item is the same.
5. Improv Everywhere redesigned their site to make it look PAINFULLY 90s.
6. XKCD, Questionable Content, and Dinosaur Comics have all switched domains.
7. IGN released an epic fake trailer to Legend of Zelda the movie.
Sadly enough, I did not see a single prank in real life yesterday besides my own. Lame.