How Much/Mile?

I heard about the mileage tax, and assumed it was a non-starter. However, that may not be the case. I don't know how I feel about this one. It might be useful if it spurs development of public transportation alternatives in places like Florida, Texas, and California, where the car is still King. On the other hand, it does have definite Big Brother implications, although given that most cell phone technology includes some form of GPS, I don't know what all the fuss is about. Something to chew on.