JD- this guys thesis is consistent with ideas put forward by other engineer types who were not involved in any official report. The quick clean-up of the site does nothing to assuage suspicion. Someone above asked why the airplanes, if the "terrorists" could have simply blown-up the buildings. Well, airplane crashes are far more spectacular and create a greater environment of fear.

Then there is that bit about the passport of one of the hijackers that was found near the WTC. Steel beams melted, but someone's passport was found intact several blocks away from the site of enormous destruction. Should I cover my cranium with aluminum now?

As was rightly pointed out in the original post, a conspiracy of this magnitude would be hard to hide.