Cross posted, but worth it
I watched this movie today. It's a documentary about September 11th called "Loose Change." I know there are a lot of conspiracy theories out there, but this one sounds like the makers really did their homework. The movie was made by three college students who decided they would rather find out what happened for themselves than listen only to what the media had to say.
It's an hour and 22 minutes long, but I think it is definitely worth watching.