Trapster lets people with mobile phones document the exact location a speed trap or red light camera is. It works best with GPS and WiFi-enabled Windows Mobile or Symbian devices, but they have ways that people with any cell phone can report speed traps. I reviewed the Symbian version of the app, which like the service itself, carries the beta tag. If you don't have a Symbian or Windows Mobile device, but have a phone that is capable of reaching the Internet, you should be able to hit http://www.trapster.com/m and get a mobile version of the trapster site to report speed traps. If you have a send and end phone (i.e. a phone with no Internet),  you can hook up with Jott and speak you speed traps into the phone. I think this service has great potential. However, I also think it has a ways to go before the masses will start using it. GPS in mobile phones is still relatively uncommon. The User Interface for this app--at least on the Symbian version--clearly needs some work. It is a service worth watching, however.