The Stuxnet Worm was first discovered in July 2010 by a security firm in Belarus, but did not make global headlines until months later when Iranian state media announced the Middle East nation had been the target of a coordinated attack.
The Stuxnet worm was "the first of its kind. It was written to specifically target mission critical control systems running a specific combination of software and hardware.
There are a lot of concerns that the Stuxnet worm could be altered to attack key components of any nation's infrastructure, from electricity grids to oil rigs.
Many experts believe that the Stuxnet worm was only the beginning of a new kind of cyber attacks against critical infrastructure.
It’s quite possible the in 2011 or 2012 that we will see copycat versions of Stuxnet been used by terrorists to try and cripple the infrastructure of some of the major powers.