What I'd like to see in an iPhone app is one that uses your current location to tell you where the nearest truck stops, public scales, and truck washes are, then lets you click to a map with truck friendly directions... now THAT would be something useful.
Radar Cams in use in Chattanooga and migrating to K-Town http://www.wbir.com/news/local/story.aspx?storyid=52283