James, I recommend reading this article: ‘Son of Stuxnet’ virus could be used to attack critical computers worldwide. It talks about a recently discovered variant of Stuxnet (possibly) that poses significant risk to infrastructure. Whereas Stuxnet specifically targeted Iranian nuclear processing capabilities, Duqu (the name of this variant) is much more general but does appear to be targeting infrastructure, or as the article says, “industrial command and control systems.” Zero Day, a recent novel by Mark Russinovich, a technical fellow at Microsoft and one of the authors of the excellent Winternals utility suite, deals with the potential harm such an …