For anyone who has been exposed to some of the conspiracy theories around September 11th, it's a typical example of how 'facts' can be selected and arranged such that the interpretations lead to very different conclusions.
For another (and potentially more informed) perspective on a lot of the theories, be sure to check out this
Popular Mechanics report.
But, it's just as one-sided only reading the 'popular' side of the story as it is only reading the conspiracy-theorist side, so if the Popular Mechanics article is your first look, then you might want to take a second look as well.
Here is a site that has links to enough theories to keep you busy for a long time...