Before people start posting sites that claim the U.S. government was behind 9/11, here's a site that has debunking info, mostly regarding "controlled demolition" conspiracy theories:

http://us.geocities.com/debunking911/index.htm

For those that STILL think that a lot of people believe the poppycock that Alex Jones, Steven Jones, and others are pushing, I'd suggest a trip to New York City. Talk to some of the people that were in lower NYC that day - and since.