All right, this story from 2002
is a little stale, but the Washington Monthly dismisses cyberterrorism as Chicken Little stuff.
There are many ways terrorists can kill you--computers aren't one of them.
The article explains that Richard Clarke invented cyberterrorism as a way to stay employed in a new administration:
At the center of all this hype is Richard Clarke, special adviser to the president for cyberspace security, a veteran of four administrations, and terrorism czar to Bill Clinton. Even though he was a senior Clinton official, Clarke's legendary bureaucratic skills saw him through the transition; and when replaced by Gen. Wayne Downing after September 11, Clarke created for himself the position of cybersecurity czar and continued heralding the threat of cyberattack. Understanding that in Washington attention leads to resources and power, Clarke quickly raised the issue's profile. "Dick has an ability to scare the bejesus out of everybody and to make the bureaucracy jump," says a former colleague. http://www.washingtonmonthly.com/features/2001/0211.green.html