OK what happened to the posts here a couple of days ago claiming use of thermite type explosives to produce a controlled demolition of the towers?
It seems pretty unlikely that both towers would collapse in such a symmetrical fashion (even allowing for the devastating impact)
The theory that the floor trusses softened in the heat and then fell in a chain reaction does not explain why the massively strong steel core of the building should not have remained at least partially standing.
Plenty more "conspiracy nut" material at http://www.whatreallyhappened.com/