A (Good) Book on Screenwriting

I encourage any one who fancies themself a screenwriter to take a look at J.J. Murphy's book, Me and You and Memento and Fargo. Murphy takes a sampling of American Independent film and compares it with the conventional Hollywood model (as preached by Field, McKee, and the like). Things like how they differ from, yet still adhere to, the three-act structure. Or how having a non-active/non-goal-driven protagonist changes how the drama of your narrative works. It's really good stuff.