I saw Fahrenheit 9/11 this holiday weekend, and overall I was fairly impressed. I've maintained a mild dislike of Michael Moore ever since I had the misfortune of seeing his piece-of-shit-Bowling movie, so needless to say, I had low expectations of Moore as a filmmaker. I can say, however, that I was hyped about seeing this flick, so that balanced things out. Like I said, overall, I was fairly impressed.
Of course, this movie has gotten people up-in-arms raving about how the movie is nothing more than a pack of lies. I've seen a lot of goofy "criticism" of Moore and his latest artistic endeavor. Don't believe everything negative you hear about this movie. However, that being said, don't believe everything you see in F911 either. For some balanced criticism of Moore's conspiracy theories, check out Brendan Nyhan's article on the topic at Spinsantiy. Rather than screaming about how Moore is a dirty liar, Nyhan does a decent job of pointing out some parts of F911 where Moore strings mostly accurate things together to give a potentially misleading impression. Good reading.
And even better, for your linking pleasure, check out an unofficial transcript of the first 43 minutes of Fahrenheit 9/11. I can't vouch for the accuracy of this transcript.