Popular Mechanics has a very good article laying waste to the more bizarro 9/11 conspiracy theories — 9/11: Debunking The Myths:
Three and a half years later, not everyone is convinced we know the truth. Go to Google.com, type in the search phrase “World Trade Center conspiracy” and you’ll get links to an estimated 628,000 Web sites. More than 3000 books on 9/11 have been published; many of them reject the official consensus that hijackers associated with Osama bin Laden and Al Qaeda flew passenger planes into U.S. landmarks.
[…]To investigate 16 of the most prevalent claims made by conspiracy theorists, POPULAR MECHANICS assembled a team of nine researchers and reporters who, together with PM editors, consulted more than 70 professionals in fields that form the core content of this magazine, including aviation, engineering and the military.
It’s a very good examination at the facts and doesn’t stray into speculation, I just wish it had come out sooner than 3 and a half years after the tragedy. No doubt the conspiracy theorists will respond that Popular Mechanics is shilling for the Pentagon/CIA/NSA/Aliens.