I'm a great admirer of PK Dick's work!
From Ubik to A Scanner Darkly, his books are masterpieces. Worlds he made are so crazy! And he was a visionary.
I'm especially found of his last books, VALIS, RAdio Free Albemuth, The divine invasion and The transmigration of Thimothy Archer. With his fiction, he tends to theorize what he lives in his real life, all his my mystical experiences. At the same time, he started to write the Exegesis.
I've read several biographies, the one by Sutin "Divine Invasions: A Life of Philip K. Dick", an other by E Carrere "I Am Alive and You Are Dead: A Journey into the Mind of Philip K. Dick". I've got 3 books of his selected letters...The man is quite lovable, full of obsessions that has driven him to write wonderfull books.
Does someone has read "What If Our World Is Their Heaven? The Final Conversations Of Philip K. Dick"? He tals about his next book, A Owl in daylight, which has never been written...