One of the motorcycle email lists i subscribe to is called CycleRides.com, run by Barry Caraway, a local bike enthusiast.
He put together a really good collection of information and articles on how the new "Stationary Photo Enforcement Cameras" work, as well as comments from law enforcement and how they also view them.
I think it's one of the better overall presentations of technically how the system works, the fines involved, the how and why. Good pictures of the lanes, and how it identifies speed of each car in each lane of travel, etc.
http://www.cyclerides.com/WeeklyUpdate11_5_08.htm