Kevin Ryan on Google Video
If you are unfamiliar with Kevin Ryan or if you have never seen his PowerPoint presentation and lecture, it's time well spent.
More recently, Ryan spoke in California for the launch of "9/11 and American Empire Vol. I: Intellectuals Speak Out", and that is currently streaming at Bonnie Faulkner's Guns and Butter archive: http://kpfa.org/archives/index.php?arch=16697
Also, his article, What is 9/11 Truth? - The First Steps - pdf - 42kb is good stuff. (Online at ST911.org.)