This book teaches you all there is to know about spliff rolling, from how to make the most simplest L plates to the most complicated Windmills (see sample pics) that will impress your friends everytime aswell as giving you an amazing smoke. It also gives you info on, How to make the mix perfect, How to roll them properly, and much more. I really think that this is a must for all ganja smokers from beginners to pros, this book could probably teach Jah a thing or two. This is an amazing book! 
 
http://www.amazon.com/Joint-Rolling-Handbook-Expert/dp/0932551238/ref=sr_1_1?ie=UTF8&s=books&qid=1306356441&sr=8-1