Bruce Schneier blogs about the pervasivness of cell phones into our lives the volume of data you can collect from them.
He and his team were able to create detailed views of life at the Media Lab, by observing how late people stayed at the lab, when they called one another and how much sleep students got.
Given enough data, Eagle's algorithms were able to predict what people -- especially professors and Media Lab employees -- would do next and be right up to 85 percent of the time.