My friend told me about this documentary qhich questions many of the "truths" our world is built on. When I watched it I was quite shocked. Whilst some of it is obviously not entirely true, there are many...many convincing arguments that will make you think differently about certain things.
The vid is called "Zeitgest". It is a US production so some of you may have heard of it, however I've only just seen it, and it's pretty good I've gotta say. It starts quite slow so you can skip around the 1st 10mins to part 1. It is around 2 hrs long but if you can sit through - I found it quite interesting.
http://video.google.com/videoplay?docid=-594683847743189197It's a free vid but is quite large (around 700mb) so don't watch during peak hours if your ISP incurrs traffic management as they'll slow your conenction because of heavy use.