I'd like to recommend Stanley Cavell's Pursuits of Happiness: The Hollywood Comedy of Remarriage.

I highly recommend Warren Buckland's Puzzle Films: Complex Storytelling in Contemporary Cinema (Wiley-Blackwell, 2009). A sequel is about to appear. Intelligent analyses of non-linear films, including films that don't come out of Hollywood. A must for every screenwriter who aspires to write outside the box.

This is going to sound strange, but I recommend Robert Pirsig's Zen and the Art of Motorcycle Maintenance. Why? I dunno. It's a good book that has absolutely nothing to do with movies. But there's a lot about storytelling that can be gleamed from it. Pirsig explores the definition of Quality - how is it so hard to define, yet we often know what it is when we see it? He does so through Romanticism and Classicism. Romanticism is a lot like following the muse. In the book, he would discuss it in terms of a motorcycle: how those who are more romanticists would look at a bike and see two wheels, a seat, handlebars... they might see the beauty of it, but not be so much inclined to see how the form meets the function. A Classicist would be more intrigued by the underlying structure of the bike. What makes it run? What are ALL THESE PARTS!? What do they do? How do they work together to get the bike in motion? Sound familiar? I'd submit there's a lot of romanticists in Hollywood. There's not a lot of classical thinkers. In the end, Pirsig determined it was best to leave Quality undefined. It's a matter of using BOTH: a writer needs his muse (romanticism), but if he/she wishes to communicate a message through their writing, then they need a grasp on the underlying structure that they can hang their argument on (classicism) - for it's that very thing that ultimately becomes "theme".