Very nice new feature in Gmail Labs: undo sent email. Gives you a few seconds after sending an email to change your mind and cancel it. Now we just need some way to reach into somebody’s email a few minutes or hours later and delete poorly thought out messages. I wonder if anyone would object if Gmail let you recall messages sent to another Gmail account at any point up until they are read. AOL used to let people do that (it wasn’t a bug it was a feature).