This is a good basic guide to Yoga, including the spiritual aspects. Half of it focuses on the spiritual aspects (which I personally liked), and the other half focuses on the most basic and a few advanced asanas (poses). Also diagrams the Sun Salutation and Moon Salutation. This book also has some v...
I actually prefer Yoga for Dummies because it has better step-by-step instructions and photos. This one uses drawings, so it's hard to tell what your body is supposed to look like, and the instructions aren't quite as clear as Yoga for Dummies. HOWEVER, there is a lot of valuable info in this book...