New in Gmail Labs: Undo Send

Gmail has brought up a new feature in the Google Labs: Undo Send - feature which allows you to edit/modify the email which you have sent just before. It's really interesting and helpful for those who are in hurry when they send email. If you just forgot to include something just undo send and make the changes and then resend it.. Wow !

GMAIL says:

"Sometimes I regret sending a message the
morning after. Other times I send a message and then immediately notice
a
mistake. I forget
to attach a file or email the birthday girl that I can't make her
surprise
party. I can rush to close my browser or unplug the Internet — but
Gmail almost
always wins that race. An email to the wrong Larry pushed me
over the edge. I
could undo just about any other action in Gmail — why
couldn’t I undo send? Many
people agreed, including Yuzo Fujishima, an
engineer in the Tokyo office. My
theory (which others
shared) was that even just five seconds would be enough time to catch
most
of those regrettable emails. And now you can do just that. Turn on Undo
Send in Gmail
Labs under Settings, and you’ll see a new “Undo” link on every sent mail
confirmation. Click “Undo,” and we’ll grab the message before it’s sent and
take
you right back to compose."

Official Gmail Blog: New in Labs: Undo Send