What Really Hit The Pentagon?

Conspiricy theorists unite. Here is one for the ages:

Working from his home office in a small town in England, Darren Williams spent four weeks this summer making a short but startling video that raises novel questions about the 2001 attack on the Pentagon.
The video, "9/11: Pentagon Strike," suggests that it was not American Airlines Flight 77 that slammed into the Pentagon, but a missile or a small plane.
The pictures seem incompatible with damage caused by a jumbo jet, and no one mentions seeing one. Red arrows point to unbroken windows in the burning building. Firefighters stand outside a perfectly round hole in a Pentagon wall where the Boeing 757 punched through; it is less than 20 feet in diameter.
Williams created a Web site for the video, www.pentagonstrike.co.uk. Within 36 hours, Williams's site collapsed under the crush of tens of thousands of visitors. But there were others to fill the void.