Whether in-depth guides to the asanas or a closer look at philosophy, these make for a good read.
Cool Yoga Tricks by Miriam Austin - Just like the name sounds, this is the neatest book for helping find just the perfect modifications with props to suit your circumstances.
The Complete Guide to Yin Yoga by Bernie Clark - A complete and thorough resource for Yin yoga practice, including a thorough listing of asana postures, as well as the theory and philosophy behind the practice of Yin.
Yin Yoga Principles & Practice (10th Edition) by Paul Grilley - Yet another great take on the practice of Yin, with a few different postures added to the mix.
The Key Muscles of Yoga by Ray Long, MD, FRCSC - There are actually six books in this series, Key Muscles, Key Poses, plus four mat companions. They are all worth their weight in gold - very detailed, beautifully illustrated, and easy to comprehend.
Anatomy of the Spirit by Caroline Myss, PhD - This is the best beginners guide to the Chakra system ever. Learn about the different energies associated with each Chakra and how they apply to your life.
Eastern Body Western Mind by Anodea Judith - East/West takes a psychological journey through the Chakra system, challenging you to identify with your archtypes and life experiences. Learning from these things gives you another tool to defining your self and your decisions in life.
Invisible Acts of Power by Caroline Myss - In this book, Caroline Myss shows us how to identify with the acts of service that we receive and that we perform for those around us from the perspective of the Chakras. After reading this, you will think more about helping those you touch with humility and compassion. A short read with a great impact.
The Bhagavad Gita as translated by Eknath Easwaran - This is a beautiful edition of the classic Indian work of philosophy, not to mention easily read. The story of Arjuna's struggles with attachment are easy to relate to, lending an aura of familiarity to the telling.
The Element by Ken Robinson, Ph.D. - If you're looking to reinvent yourself or promote life change, The Element is a pocketbook guide to finding the courage to follow your dreams, live your passion, and utilize your talents in service to yourself and those around you.