Before I tried knitting or bookbinding or screen printing, temari balls were my crafting obsession. These are over 10 years old (please excuse the dust).
If you are interested in learning temari, I highly recommend Diana Vandervoort's book Temari: How to Make Japanese Thread Balls (ISBN 0-87040-881-X). It has very clear instructions and is illustration heavy, just what you want in a craft book. Vandervoort has a few follow-up books with additional techniques/patterns.