This book was actually recommended to me belt, Aikido student and I have never regretted it's purchase. I tend to study sword-styles, and Aikido offers several movements based on sword-fighting principals (as well as actual sword-fighting based on old samurai movements).

It also has a bit on the history of Aikido, breathing, meditation, the life of Ueshiba Morihei (the founder of Aikido) and a glossary of Japanese terms. The rest of the book is mostly dedicated to movements. All in all, this is a must-have for anyone even remotely interested in Aikido.

up book authored by John Stevens that takes more advantage of his knowledge of Eastern philosophy as can be experienced through aikido, but the other books he has written are good additions to read along with Aikido: The Way of Harmony. If you are looking to be introduced to aikido or want to give a gift that encompasses the art from the elementary to the advanced, this would be my pick. Stevens avoids getting to heavy on the Japanese terms and philosophy that might scare of the beginner. The sad part about the book is knowing that Shirata Rinjiro recently passed away.