Ok, this is cool. I had read about this recently, but not actually looked at it myself.
If you are using Google+ and Gmail, you'll now see a new option on the left nav - "Circles" - that if you click it open you'll find all of your circles.
Click on a circle and it will filter your inbox just to show you emails from people in that circle.
This is slick - a whole new way to sift through your inbox.
This will be a big boon for companies you add to your circles in Gmail.
introspection technology entertainment-books and magazines sift work diet/exercise video funny cars worth repeating Christianity/church ideas and creativity bad company transit and development advertising / branding / marketing email music unclutter random food entertainment-television Google by-week 750 Starbucks 120 family #blogaday cool coffee parenting L.A. architecture entertainment-movies environment leadership Christmas Apple Seattle autism atad entertainment photos art and design weather politics by-year geography identity rain social Amazon home improvement travel Disney by-month money snow charity dream Lego how to vacation awful conference crime simplify children AT&T LOST news sports education fashion clueless improvement links no-bars-blog 2013 NASA NBC GTD fail good company holiday nostalgia trust30 war 2014 empowerment journalism legal picky power powerless quoted Cuba Lori cord-cutting focus great day inspirational radio Federal Way McDonalds Rachel Tacoma medical videoblog Boeing Microsoft Wal*mart art buffy conspiracy culture laundry sellout web 2015 PLU customer service fool review robots and drones