As a follow-up to this long ago posting, the National Highway Traffic Safety Asministration has passed a resolution requiring car manufacturers to inform buyers if their cars are equipped with event data recorders (EDRs). Car manufacturers must comply with the new regulation beginning in the 2011 model year; currently, about 64 percent of model year 2005 cars are equipped with black boxes, and some car makers do note their presence in the owner’s manual (that nobody reads).
Still to be done: Federal legislation on the type of information that can be collected, who can access it, how it can be used, and how it can (or cannot) be shared with 3rd parties.
MichaelZimmer.org 
SIR, I ve read a lot of articles on the auto black boxes. I would like to do further research on this subject . Who manufactures it ? Are there many companies making them? ROY L.SHERMAN
I don’t have a list of manufacturers, but here are some links that might help guide your research:
NHTSA page on EDR
EPIC page with references
Fatal Exit, The Automotive Black Box Debate book at Amazon
Accident Reconstruction Network, with many links
Additional resources here, and, of course, my various blog posts.