Google Circles

It has been rumored that Google will soon launch a new social networking system called Google Circles.  Do we need a new social network?  The emphasis stated is that this will be about circles of colleagues and the ability to tailor persona's easily.  A good idea, depending on its execution.   An excellent overview in ReadWriteWeb. So what is happening to Buzz?  Likely on its way out as Circles emerges. Make sure to get the privacy right this time, easy to use, and don't make it GMail-centric.