There's a very interesting video about 9/11 that every American really, really, really should watch put out by a group called Architects & Engineers for 9/11 Truth.
Actually, that AEA911Truth video is very good with some very high calibre scientists and engineers discussing the event. I especially liked Lynn Margulis's description of what science actually is and how the follow up "investigation" cannot be called scientific by any stretch of the immagination. You should watch it before you just dismiss it.
"9/11: Explosive Evidence - Experts Speak Out": https://www.youtube.com/watch?v=Ddz2mw2vaEg