Google recently announced (via) the buy of Behavio, which apparently is a mobile data collection and analysis technology. With this system Google can collect all sorts of data from millions of mobile devices and make educated decisions about events about to happen.
The goal was to analyze things like physical location, contacts and other data about your activities and environment to monitor trends, then make predictions about behavior. The targets weren't just individuals though, but entire communities. It was even suggested that Behavio could predict the eruption of mass protests.
To me the whole thing seems pretty scary to me. A little to much big brother heh?