Interesting Churchill Club discussion on location-based services, what has been labelled where2.0. The key take out that I took from it was the slow pace of inside wireless location-based services. I know vendors that have been at it for over a decade and companies like EADS and Ruckus Wireless. Yet, it still seems to be an area of relatively slow adoption (at least at the moment). Ultrasound or BlueTooth LE beacons seem to have only esoteric adoption.
More on where2.0 related issues here.