by Carol Zaleski and Philip Zaleski (2006).
One of the most interesting and readable non-fiction books I've tackled in a long time. I don't even know if I can express what about this book was so wonderful to me. I loved the attitude they took in discussing prayer--never sarcastic, always considerate.
I most enjoyed the sections on types of prayers and people who pray, though of course I learned a lot from the whole book, even the sections I was less interested in. I even learned some new prayers, and learned about some new writers, mystics, and saints.