Zeitgeist the movie

http://www.zeitgeistmovie.com/main.htm

Interesting documentary film on different conspiracy theories.
Part 1 : The Greatest Story Ever Told (Christianity)
Part 2 : All the World's A Stage (the attacks of 9/11)
Part 3 : Don't Mind the Men Behind the Curtain (Federal Reserve Bank)

Good, but as any conspiracy theory, need to stay objective toward it and to keep in mind it's often just an interpretation of the reality (as anything shall I say).