A couple of the Pentagon systems he hacked were monitoring systems for Chemical and Biological warfare. Not something that should be tampered with. In this case, ignorance should not be an excuse. I don't want that to happen again. See link at left.
Arguments can go both ways.
I personally think its a great idea. In fact for about 6 years now I've wished the cabe tv companies would adopt the same strategy. Finish tire maker Nokian Renkaat is working on a smart tire. It will have sensors that work together to monitor pressure and temperature and notify the vehicle owner by wireless messaging via the Bluetooth messaging technology. Not a new idea, but now some major retailers of PC equipment and systems are starting to make offerings.