It's not about the system or sector that STUXNET is attacking. It's abou the concept that an undetectable piece of malware is attacking a network or system that no one probably worried about. I doubt there is NORTON A/V that you run on this stytem. So think about your own network. What non-microsoft, non-mainstream systems to you deploy. How about that new car you bought with built-in bluetooth technology? Your kid d/l's a file on their IPOD and links it to the car stereo. Then when the file is accessed, a code is sent to the cars computer via the link between them for speed volume control. By the way that code was to disable the brakes and increase the throttle. Is this likely, no, but possible. We forget that although some devices may not be directly connected to the internet, they are connected to a network, or become connected at some point. The bad guys understand this and are finding ways to infect these sytems that we thought where "secure". That is Everyday IT as you put it.