It appears that the further away that we get from the events of September 11, 2001, the more people want to seek comfort in conspiracy theories which explain how things could have gone so horribly wrong on that day.
Unfortunately, it seems like those who would want to twist the events into a conspiracy theory are gaining ground. For example, an outfit called 911Truth has raised over $20,000 this year. More than 30% of the U.S. now believes that the attacks were as a result of a conspiracy involving our own government (which either participated in the attacks or allowed them to happen).
For those who want to see a bit of the facts, Popular Mechanics has done a lot of work reconstructing what did happen in New York and Washington, D.C. Their editor in chief, James B. Meigs, recently put pen to paper again summarizing the results of their investigation into the claims of the conspiracy theorists.
It took 30 years for Pearl Harbor to become a major conspiracy theory playground. The wonders of the internet.