One of the cool features of the Droid is that the Maps application has traffic data. (You need to go to the layers and add the traffic layer). Unfortunately, it obscures the street names so it is a bit awkward. Where does the traffic data come from, and how often is it updated? Do I need to refresh the screen to get it updated? Do they gather GPS speed data from all the Droid users and use that to come up with real time traffic (like the late Dash Express, which was a cool idea that died). Or do they rely on state highway departments for data? Or do they get it from somewhere else?