Chrome
As of today, it is still in Beta but Google's vice president Marissa Mayer said Chrome will be out of Beta before the end of the year.
This will probably be one the fastest product developed by Google that will be taken out of Beta given Gmail is still officially in Beta for last 5yrs??
Google Chrome news was accidentally leaked on September 1, 2008 and it was officially launched on September 2, 2008
Surprisingly, Chrome is not yet available on Mac!