The Yoga Sutras of Patañjali: A New Edition, Translation and Commentary, by Edwin F. Bryant. If you have any curiosity about Indian philosophy, I highly recommend this book. Bryant surveyed all the commentaries on Patañjali, including not only various Hindu schools, but also Buddhist and Muslim commentaries, and incorporated the material in this comprehensive volume. Highly recommended.
Personal Memoirs, by Ulysses S. Grant. I read this book out of a curiosity raised by frequent reading in Ta-Nehisi Coates's blog on Atlantic.com. A must for those interested in US history or the US Civil War.
Turtle Feet: The Making and Unmaking of a Buddhist Monk, by Nikolia Grozni. My new all-time favorite "spiritual" memoir, Grozni's slow awakening to the pretensions and underlying reality of spiritual pursuits in the Himalyas is funny and rich.