Stuxnet Deep Dive
Ralph Langner provides the most detailed presentation of the Stuxnet S7 code to date. He goes through the key Function Codes and Data Blocks in detail and shows how it matches to the Natanz facility. You see Ralph's teams comments throughout the Stuxnet code, and the level of detailed analysis.
Ralph asserts, and seems to convince the audience, that we can be 100% sure that the Stuxnet was build to attack Natanz.