Trapster lets you report speed traps, people slow down, everybody wins

I just signed up for Trapster, a free application for your cell phone or PDA that lets you report speed traps - and alerts you to speed traps that others report. I am going to download it to my iPhone and see how well it works. You call an 800 number to report any speed traps. Your alert is relayed to the PDAs and phones of people in the vicinity. They can rate the reliability of the reports. You can add it to Google Maps using Loki. It is an intriguing use of presence awareness.