I just received my copy of Douglas Keesey's new book, Brian De Palma's Split-Screen: A Life In Film. I'll have to write more after I've read it, but upon initial browse-through, it appears to be a thoroughly-researched examination of De Palma's cinema, and an interpretation of each feature film (each one has its own chapter) as it relates to De Palma's personal life and career.
There is also a nice bit in the Acknowledgments: "No accounting of intellectual indebtedness would be complete without recognizing the key role that Geoff Beran and his website, De Palma a la Mod, have played in keeping viewers informed about all things directly or even tangentially related to De Palma. Beran's site is an endless treasure trove of facts, interpretations, opinions, and Web links, and it would be impossible for me to count how many times I visited it during the writing of this book." In the same paragraph, Keesey goes on to thank Bill Fentum, Romain Desbiens, and Ari Kahan.