This is not directed at anyone in particular:
I'll take the unpopular stance here and say that the black boxes are a good thing. Even if the conspiracy theorist, "Big Brother"-fearing paranoids are right that it will turn into another plot by the man to keep us down.
Sure, I don't like the theory that my insurance company could eventually track me via satellite and assess my driving habits as "dangerous." Personally, I doubt it would ever come to that.
But the flip side of that is that if some retard is driving 125 MPH in traffic, and causes an accident that maims or kills someone I love, I'd like to be able to use the data collected by that black box to nail his/her butt to the cross. Accident reconstructions aren't always air-tight. That data would just add more proof to the pudding, so to speak.
Then there's the fact that car manufacturers use that data to research contributing factors to accidents and traffic fatalities, then they can design safety measures accordingly. How is that a bad thing?
As it stands right now, these data recorders only record on a limited loop, and data is overwritten something like every 30 seconds (at the longest). As far as I know, there's no way for them to store data in the long term and assess your typical driving habits.
Like Fformula88 said, the trick is not to crash your car going 125. If you the data recorder shows that you were going excessively fast, swerving, at wide open throttle when you totaled your car, maybe your insurance company SHOULD refuse to cover you, depending on the other circumstances.