Google's Project Tango

Google's Project Tango is a very interesting project that brings an entirely new focus to crowd sourced mapping data.

How Micro-Location, Geofencing and Indoor Location are Driving the Retail Revolution

Thanks again to GISCafe for pointing us to this great article.  The interior of stores have been mapped for a while.  The difficult part has been  determining your position in the store in 3-D.  Sounds like there have been breakthroughs in that technology that will now allow us to use services similar to the GPS we use for driving, only now for indoor shopping.  This is a game changer.