Stuxnet was one of the world's first real cyberweapons, and was used by forces unknown to destroy Iran's uranium-enriching centrifuges and sabotage the country's nuclear ambitions in 2010. But now a newly discovered piece of malware called "FLAME" has dwarfed Stuxnet in both size and scope. It seems to have been created by a nation-state - one with a lot of interest in the Middle East.
Update, June 20: The Washington Post reports that the FLAME malware was a joint project between the US and Israel. FLAME's purpose, an unnamed Western official said, was to map and monitor Iran's computer network in preparation for a cyberwar campaign.