conspiracy theories ..... are they for real?

I recently came across a blog ranting about the conspiracy theories that cloud the 9/11 incident.
It quoted some very interesting videos and articles. So I decided to include some of them over here.

http://video.google.com/videoplay?docid=1822764959599063248
http://video.google.com/videoplay?docid=-8260059923762628848

And to present both sides of the story, some articles that actually rebuke these conspiracy theories
http://ourworld.cs.com/mikegriffith1/refute.htm