Kubrick
The Guardian has an interesting article looking at the secretive world of the late Stanley Kubrick. What I found most interesting about his film-making method is that he could research every little detail for a movie, and he might create something brilliant (2001 or The Shining), but he still might create a pile of crap (Eyes Wide Shut). However, his brilliance to crap ratio was pretty good, so his system was probably worthwhile. (Another article on working with Kubrick.)