Gmail Custom Time New feature
 

Funny April fools from Google, wonder how many people think its real

New! Gmail Custom TimeTM

Ever wish you could go back in time and send that crucial email that could have changed everything -- if only it hadn't slipped your mind? Gmail can now help you with those missed deadlines, missed birthdays and missed opportunities.

Pre-date your messages
You tell us what time you would have wanted your email sent, and we'll take care of the rest. Need an email to arrive 6 hours ago? No problem.

Mark as read or unread
Take sending emails to the past one step further. We let you make emails look like they've been read all along.

Make them count
Use your custom time stamped messages wisely -- each Gmail user gets ten per year.

Worry less
Forget your finance reports. Forget your anniversary. We'll make it look like you remembered.

http://mail.google.com/mail/help/customtime/index.html

I saw the link earlier but it 404'd on me.

Great april fool's prank :)

yeah this is pretty hilarious