I never looked into 9/11 conspiracies until recently and when I did stumbled upon the work of David Ray Griffin. The official story(ie, 911 commission report) is akin to that of the single magic bullet theory. I found the following real interesting, especially:
David Ray Griffin - 911 Commission Report: Ommissions and Distortions
http://video.google.co.uk/videoplay?...+ray+gr  iffin
9/11 Mysteries
http://video.google.co.uk/videoplay?...12003&q=9%2F11
911 revisted
http://video.google.co.uk/videoplay?...09939&q=9%2F11 
Given the evidence provided by the 911 comission conspiracy theory and the so called other conspiracy theories. There's no doubt in mind mind which holds more water.