The Complete Idiot's Guide to Yoga

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 very useful tips and advice for beginners (and maybe for those more far along). Definite keeper. :D