Here is a link to an excellent Nafeez Ahmed lecture just in case you have not heard about this yet:
http://media.putfile.com/Nafeez-Ahmed---Creating-T...
Here is the Seymour Hersh article that Nafeez references toward the end of the lecture:
http://www.newyorker.com/reporting/2007/03/05/0703...
There is a whole lot more about this lecture and its topics at 9/11 Blogger:
http://www.911blogger.com/node/10120
Another author in addition to Ganser who has written about the strategy of tension and Gladio:
Picked this up from an excellent discussion on the Rigorous Intuition forum that ranges from Kevin Coogan to Gladio to L. Fletcher Prouty to Chip Berlet and LaRouche: