You don't have to buy a book to learn more about Reiki - I just now did a Google search and was pleased to find that the Reiki.org website has a lot of great information. According to that website, Reiki is, "a Japanese technique for stress reduction and relaxation that also promotes healing."
This isn't just some random thing I read about on the web in my search for the spiritual. I was at a psychic fair a couple of years ago and had a most wonderful Reiki healing session with a kindly older woman named Alice. Though she's not psychic, she could tell where I "hurt" emotionally and concentrated on healing my heart. Though it was cool in the convetion area, her hands were quite warm and I could feel the energy. This is as close to a supernatural experience as I have ever had. Has anyone else out there had an experience with a Reiki healing?