I suppose the vulnerability of the electrical grid varies a lot from country to country (and even at the local level), but I suspect that most vital systems are inherently more robust and less prone to cyber terrorism or sabotage than is sometimes assumed. Similar concerns were raised during the Y2K scare, which turned out to be completely blown out of proportion. Maybe I'm just wary of doomsayers competing for media attention because more often than not, this kind of publicity doesn't do much good at all.

So Iraq supposedly invested in some top engineers. Not sure that was a lot of help once they had US tanks in the streets of Baghdad. Much has been said about the North Koreans hacking into Sony, but I can't really see how that would rate as a major threat to national security. Unpleasant, no doubt. But I suspect that right now at least there are real limits to what can be achieved with cyber attacks alone.

I would be more concerned about the financial sector perhaps. With so much of the economy based on completely abstract numbers and money that only really exists in banking computer systems I'm thinking that would be the easiest target and one more likely to destabilize an entire country.