Dan Gillmor talks to some futurists and considers the wireless world of the future: One of the most interesting concepts discussed these days is ad hoc networks, where devices pass communications from one to the next without communicating with a central base station. Gillmor talks about wireless technologies that could get embedded in cars to create such networks that can communicate directly with other cars. The networks would enable fun and useful applications like music downloads and map updates but could also be involved in safety mechanisms.