I bought the book and enjoyed it- real interesting stuff. I didn't realize they also made a movie.
Outfoxed is decent, but I wasn't fond of all of the cutting in the interviews. I'd rent it.
Farenheit 9/11 was awsome, but even I could tell how slanted and biased it was. But as long as you can spot it, and make your own oppinions on the matter, I think everybody should see it.