Stuxnet appears to be a very sophisticated piece of software that attacks industrial control systems, like those found in nuclear facilities. In particular, Iran’s nuclear facilities.
It’s always difficult to get to the root – pun intended – of these stories. However, this article, Who’s Behind Stuxnet? The Americans? The Israelis? – Security Watch, and this oneIranian nuclear facilities under “massive attack” by Stuxnet worm – Boing Boing both provide more detail than you might find in places like the NYTimes.com or Huffington Post. (Make sure you read the comments: there’s alot of useful information there.)
I am always suspicious of IT security stories. There is alot of secrecy and hype associated with them, and then journalists wade in and only acerbate that. It’s entirely possible it was written by some very smart engineer somewhere: indeed, I am more likely to go with that rather than believe it is “cyberwar”. Let’s see how this progresses.