The Little Book of Yoga Breathing: Pranayama Made Easy

This little book is an excellent guide for yoga breathing. You don't have to dig through long texts (although interesting as well) about eastern life philosophy and can get straight to work. Several breathing techniques are explained in a couple of pages each and categorized per purpose, e.g. concentration, energy etc. definitely recommendable, especially when you're `a starter' and just want to experience some techniques.