If you want to read something then take a look at this feature piece in today's Times by David Aaronvitch titled "9/11 conspiracy theories: The truth is out there...just not on the internet".
As one would expect, as I do when I post this, the comments have people saying that the conspiracy theories are credible because, for example, Aaronvitch does not "de-bunk the credible points - WTC7; high temps; impossible collapses;etc".
There is bugger all to that of course, because the clever scientific type engineer guys over at Popular Mechanics did it already and even published a book on it.
The point I would like to make on Aaronvitch's argument is not that I wish the conspiracy theorists would not be there, but rather that its great they are they because we can all chuckle at the death-defying leaps of logic that are made when the existence of a conspiracy is the default assumption being made.
Cue conspiracy loons.