There's an inherent byproduct to mass consumerism coupled with traceable technology, and that's data collection. GPS and WiFi have made such data collection infinitely easier, and other mandates by the government, including safety initiative E-911, have aided in this process. The result is a fine line between creepy Big Brother-induced paranoia and research capabilities that make everyone's lives easier.
Sense Networks has created a research platform, if you will, that utilizes WiFi and GPS to gather useful data that can be used by individual businesses for their own purposes. Such purposes span the gamut of advertising or product improvement, marketing solutions or anything else related to geo-locating.
There are a few services out there that touch on geo-location in some form or another, and many look to advertising potential as a driving force for making such applications useful on the consumer and business end. What Sense Networks has set out to do, however, is give a visual map of your customers, letting you know where they are at a given point in time.
From user behavior you can also extrapolate information about the actual location being frequented, over a given period of time. How many people use wifi at a given point in the day, or what are some common travel routes?