Katy of Sybil's Star posts The Great Global Warming Swindle, a counter-documentary on Global Warming. It comes across as very persuasive, but I take the view that you can make a persuasive propaganda film for just about any position on any subject.
The most disturbing part of the movie, and what makes it worth spending the hour-plus to watch it, is the way it portrays the momentum of the global warming crusade. When you have lots and lots of people heavily invested in a point of view, how can they possibly change?
Let me discuss a bit the issue of scientific evidence. To me, scientific evidence is not "a whole bunch of scientists think X." To me, scientific evidence is "Here is an experiment or a naturally-occurring event where the results are extremely unlikely to occur unless X is true." That is what I find missing in the man-made global warming story.