For information debunking the bizarre claims of the 9-11 conspiracy theorists there are a few good sites that go over the conspiracy arguments and offer valid scientific information in contrast to most of the conspiracy theorist claims that are not based on science or many facts for that matter.

Popular Mechanics...

http://www.popularmechanics.com/technology/military_law/1227842.html

They also published a more extensive book on the subject...

"Debunking 9/11 Myths: Why Conspiracy Theories Can't Stand Up to the Facts"

http://www.amazon.com/Debunking-11-Myths-Conspiracy-Theories/dp/158816635X

National Institute of Standards and Technology reports on their WTC investigation can be found here...

http://wtc.nist.gov/reports_october05.htm

http://wtc.nist.gov/pubs/factsheets/

http://wtc.nist.gov/pubs/

Other info and articles.....

- Scientific American

http://www.sciam.com/article.cfm?id=fahrenheit-2777

- Steven Dutch, Natural and Applied Sciences, University of Wisconsin

http://www.uwgb.edu/dutchs/pseudosc/911nutphysics.htm

- PBS series NOVA

http://www.pbs.org/wgbh/nova/wtc/

Enjoy the reading.