I have the book "The Varieties of Scientific Experience - A Personal Search for God". I think I have the title correct, although I don't have it in front of me. It was edited by Ann Druyan, his wife, and was based on a series of Gifford Lectures he gave around 1985. I have yet to read much of it though, because I am currently reading several other books by Sagan/Druyan, including Pale Blue Dot, Shadows of Forgotten Ancestors, and Dragons of Eden.

A recent Skeptic magazine issue (not the current one) had an excerpt from the "Varieties...." book, which was great reading. I'm looking forward to reading the book.

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Dennis Z
It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring - Carl Sagan