Owain, I could go on regurgitating the information in the Loose Change documentary, but it's a pretty good watch, and anyone with an hour and a half to burn can grab it off their website for free.

http://www.loosechange911.com/lc2e.htm

I'm sure there's a lot of stuff in there that is laughable from a certain point of view, but they point out some incredibly weak points of "our government trying to cover up their immoral actions on 9/11". Watch the documentary, then make a decision for yourself. Personally, I am so torn between wanting our government to be at fault and not wanting our government to be at fault that I don't really like to go into detail on my personal views of the tragedy.

[Linked Image from zandadev.com]