You may have heard the news lately about using anonymized cell phones location data to track traffic congestion. Well, MIT has put a slight twist to this concept. Since many students have wifi-enabled laptops or personal data assistants, the school has developed a system that utilizes the 2800 wireless access points to capture the location of individual wireless users and then display their concentrations in different areas of the school. Those that choose to do so can also display their identity. Check it out.