First there was Email Addict, a Gmail Labs experiment designed to force obsessive Gmail users to take a break after 15 minutes and to block access to instant messages.
Then there was Mail Goggles, which requires that Gmail users answer simple math problems before allowing them to send messages, in order to prevent e-mailing while intoxicated.
Gmail Labs also includes a Forgotten Attachment Detector, which will prevent messages that mention an attachment but don't actually include one from being sent.
And on Thursday, Google added Undo Send, a Gmail Labs experiment that prevents the transmission of an e-mail message for five seconds, to allow e-mail authors time to change their minds."
OMG! MY life is transformed!!