The Reiki Cafe 

There aren't many Reiki books that I like; however, there are two that I really recommend, both by Frans & Bronwen Stiene. These are "The Reiki Sourcebook" and "The Japanese Art of Reiki".

These are respectful explorations of the origins of Reiki as well as excellent texts for practitioners of any level. The Stienes do a superb job of demonstrating both Japanese and Western Reiki methods and offer practical exercises for enhancing one's Reiki journey.

Two other books that I recommend to my students are:
* Modern Reiki Healing Method (Hiroshi Doi)
* The Hayashi Reiki Manual (Petter / Yamaguchi / Hayashi)