You nailed it tom. It gets you thinking, gets some good concepts out there, but isn't any sort of standard of truth...
A friend of mine just watched the film (and Addendum) so I wrote him the following synopsis.
Part 1 - That was some heavy stuff. It's hard to not be changed by watching it. Some of the facts are botched, but the basic idea is there. Some of those concepts match up too well... I've looked into these idea further and you really do start to see links between not only religion and astrology, but religion and the human condition, etc.
Part 2 - Mostly rubbish. I think the actual collapse of the WTC was legit; we've actually gone over it several times in my courses. The Shanksville crash was also legit; they found the engines buried 60 ft in the ground.
Nevertheless, the event was exploited for military expansion and the removal of civil rights. Furthermore, religious and patriotic beliefs were tapped into to rally support.
Part 3 - I'm not educated enough on the history to know if this part was accurate or not. I do know that the DHS is totally insane though, and yes, they did try to push RFID through Congress. In one of my courses I gave a speech on the hypocrisy of their mission statement which claims their goal is "Protecting America's Freedoms".
My favorite part of Zeitgeist was the ending. They bring everything together so well and the true intention of the film starts to come clear.
(He said he might have to look into Carl Sagan) This film was actually my first exposure to Carl Sagan. I like his way of thinking because he takes things to a much broader perspective, as if he's just a distant observer. The fascinating thing is that when you look at things from this perspective, so many problems become superficial.
As for Zeitgeist Addendum, it sounds an awful lot like socialism. Some of the other concepts though, (like profit seeking creating stagnation and scarcity) make a lot of sense and I had never thought about them. I'm just not sure we will ever be able to move beyond a money system, even with all of the problems it causes us.