I’m probably the last person to find out about this but Google Labs created a feature in Gmail that I could have used many times as I am sure others needed as well, ‘Undo Send.’ There have been plenty of times where I have sent emails to clients and after sending the email I go back and realize I used the wrong word or spell check didn’t catch a misspelled word and I think to myself I wish Gmail had a Undo Send button like AOL did way back in the day.  Well to my surprise, this feature does exist and I can’t believe I never knew about it! If there is anyone else out there that has yet to discover this but needs it, in your Gmail account click on Labs and scroll down towards the bottom and enable the Undo Send, once you do that from now on whenever you send a email the Undo Send button will appear for 5 seconds before going away.