Another startup in this space is Euclid: http://www.popsci.com/technology/article/2011-11/euclid-analytics-tracks-shoppers-smartphones http://www.popsci.com/tec

Another startup in this space is Euclid: http://www.popsci.com/technology/article/2011-11/euclid-analytics-tracks-shoppers-smartphones http://www.popsci.com/technology/article/2011-11/euclid-anal... Founder started Urchin, which Google acquired and turned into Google Analytics.