Mike, if you are driving a GM vehicle, you already have a basic black box in there. The computer system records a certain amount of time that the car was running and keeps it in memory. One widely reported story had a guy gettting boned after an accident when the car said he was running about 3 times over the limit 3 seconds before impact.
I am a car guy, drive a GTI turbo now, but let me say this:
I find it funny that, in a country where the highest normal speed limit is 75, that cars are not governed or limited in any way. The number of 100MPH+ car chases, the number of young people killed in single car rollovers attributed to speed, etc, it's all pretty stunning. Automobile accidents are one of the highest killers in the 16 to 25 age group.
While I know it unlikely that this would ever happen in the "land of the free, and the home of the atlanta braves(!)", I am amazed that the ideas hasn't come up more often in Washington.
I would be for black boxes, as long as they showed me where mine is so that I cna destroy next time they need data from it
Alex