No, I'm not talking about something useful like alerting the authorities when a violent, sexual offender is on the loose. I'm talking about Japan's mobiles that track swine flu victims. This project is 100% volunteer-based and makes use of phone networks, as the mobiles effectively alert the uninfected of potential close swine flu encounters.
Implications - This project is remarkable not only because it can track swine flu victims, but also because it is run entirely by volunteers. Creating a project that has social value means that it is easy to attract people willing to donate their time to seeing the project succeed.