Gmail labs
Gmail Labs has been a platform for engineers to experiment and innovate new features to allow better emailing experience.
With a stretch of features - desired and unwanted - Google buzz has become a phenomenon overnight.
Now you can undo the mail you have sent to a friend.
Where none of the email services seem to be upgrading themselves, the Gmail labs is busy experimenting and launching new features for Gmail.
Gmail has not stopped from experimenting with its features.