The Yoga Tradition: Its History, Literature, Philosophy and Practice. A very good book which covers most aspects of the history, Philosophy and forms of Yoga. Illustrated and 720 pages.

The Deeper Dimensions of Yoga: Theory and Practice. Collection of articles related to the deeper aspects of Yoga. Good to read when you´ve covered the basics.

The Yoga-Sutra of Patanjali: A New Translation with Commentary. The classic Yoga-Sutra of Patanjali is a must read for all with deep interest in Yoga.

Yoga Beneath the Surface: An American Student and His Indian Teacher Discuss Yoga Philosophy and Practice. A book full of interesting questions and discussions.

Yoga Twenty-eight Day Exercise Plan. Excellent book, I have not seen a better beginners book on Yoga. Highly reccomended.

Iyengar Yoga for Beginners. Here is another great beginners book with clear text and good pictures.

Light on Life: The Yoga Journey to Wholeness, Inner Peace and Ultimate. Iyengar with essays on life and it´s meaning through the eyes of a Yogi.

Power Yoga: The Total Strength and Flexibility Workout. Power Yoga is a challenging form of Yoga and propably the best way to be in a super physical form. This is a Great book.

Ashtanga Yoga is the traditional name for Power Yoga and here is a very good book, his DVD´s are Good too.

Power Yoga at Home: A Practical Guide to Mastering Astanga Vinyasa Yoga Techniques is also very good and clear book.

A.M. and P.M. Yoga For Beginners. Very good for beginners

Yoga For Back Care. As the name implies this is Yoga which focuses on the back.