Have you regretted hitting the send button in anger only to face long time repercussions. Well, the bright minds over at Google labs have come up with a lifeline for this. 'Undo Send' as it is called allows you to cancel the action of sending the mail. Well you can do this only till 5 seconds as after which the mail is delivered. After those 5 seconds, you mail will be sent, even if you close the window or if you computer reboots. To enable the feature, go to Gmail Labs and click the "Undo" link.

[GMail blog via Ubergizmo]