Official Gmail Blog: Gmail leaves beta, launches "Back to Beta" Labs feature - http://gmailblog.blogspot.com/2009...
"We realize that after five years, this leaves some of you wrestling with some tough questions. How will you ever get used to using Gmail without that familiar grey "BETA" text greeting you when you log in everyday? What example will you cite the next time you make an internet joke about perpetual betas? Don't despair... Just go to Settings, click on Labs, turn on "Back to Beta," and it'll be like Gmail never left beta at all." - Keith Coleman
Ahhhh safe, familiar Beta. - EricaJoy
im using back to beta :) - Georges Harik
I'm back too :) - Kaspar Minosiants
Congrats! Who would have thought hide-able labels and drag-and-drop would be the features to bring Gmail out of beta? ;-) - Kevin Fox
Kevin LOL - Susan Beebe
I hear the criteria was tape backup actually. - Evan Parker