A breakdown of how STUXNET took down Iran's Nuclear Program

Interesting (albeit non-technical) description of the Stuxnet worm.

"Ralph Langner, the computer expert who was the first to sound the alarm about Stuxnet ... argues that no single Western intelligence agency had the skills to pull this off alone. The most likely answer, he says, is that a consortium of intelligence agencies worked together to build the cyber bomb. And he says the most likely confederates are the United States, because it has the technical skills to make the virus, Germany, because reverse-engineering Siemans product would have taken years without it, and Russia, because of its familiarity with both the Iranian nuclear plant and Siemans systems."