Just watched Bitter Lake on iPlayer.
Potted history of the rise of Wahhabism, the history of Afghanistan and the inability of the west to understand the war there. Also touches on the surrender of power to the banking industry, the rise of Saudi Arabia and the process of governments simplifying arguments into good vs evil leading to the rise of the Islamic caliphate.
Much of it is very broad brush stuff, given the complexities of the subjects involved but it's recommended viewing. http://www.bbc.co.uk/iplayer/episode/p02gyz6b/adam-curtis-bitter-lake
Oops, just saw Useless already posted about this further up the page.