Here in Chicago we do not have many speed traps (it's hard to get enough speed going in between stoplights to make a Chicago cop turn his head with so much traffic). If you do live in an area where speed traps are the norm though, take a look at Njection Speed Trap mashup, a service which gives users the ability to find out where speed traps are most likely to be placed and pinpoint them on a map.

The Web application combines Microsoft Live Maps and the ability to pinpoint and review speed traps located anywhere on the planet. The information shared by its members is placed into a database and can be viewed by anyone. Members of Njection.com community have the ability to add new speed trap locations and can review speed traps already posted. In addition to the location of the trap, members can post detailed information such as the type of speed detection used, posted speed limit, and level of enforcement.