For the best on debunking this crap, look here....
http://www.youtube.com/profile?user=MarkyX
I don't know who MarkyX is, but I suspect he lost someone on 9/11. If you go through the videos he posted, he goes point by point on all of these wacko theories.
It took me an entire day to go through "Screw Loose Change" but it was well worth it.
Thanks for the link!
(and thanks for your home page, very interesting!)