I moved it to Talking About Talkies, Site Chat is for things specifically related to the operation of NitrateVille.
If you truly love film, I think the healthiest thing to do is not read books on the subject. I prefer the glossy film magazines with their big colour photos and gossip columns, or the National Enquirer. Such vulgarity is healthy and safe. —Werner Herzog
Several years ago, I spent a few hours in a library going through Stephen A. Black's O'Neill biography: http://tinyurl.com/3upyd78
I didn't read it cover to cover and can't compare it with other works on O'Neill, but Black seemed to have a good handle on his subject. Several passages and descriptions have stayed with me all this time, and it seems as good of a place to start as any.