Read about Progressive's SnapShot Program talked about on CBS's MoneyWatch!
Mileage Plus Aggressive Driving The Snapshot program from Progressive Insurance has 100,000 customers and is available in 30 states (check this map to see if your state is one). With Snapshot, you plug in a device (at left) about the size of a garage door opener into your car’s diagnostic port (often under the dash below the steering wheel). For 30 days, the gizmo sends data back to Progressive about how many miles you drive at what time of day and attempts to discern if you are an aggressive driver. (Lots of braking translates as aggressive since tailgaters hit their brakes a lot). After 30 days, Progressive will tell you, based on your mileage and driving habits, whether you qualify for a discount of up to 30%.
