The main story is about a SCADA Worm attacking various targets such as Iran or Siemens on the Internet as reported by the press.
From the Mandiant blog:
Tuxnet Memory Analysis and IOC creation
The stuxnet malware has been making the press recently for two reasons. First it contains two drivers signed with a legitimate (at the time) cert. Second is it’s targeting SCADA systems. The malware is cool for a host of other geeky reasons. ...