The following books have been most helpful for me, and I highly recommend them to anyone who is serious about their training.
Awareness Through Movement - Moshe Feldenkrais
The Potent Self - Moshe Feldenkrais
Rolfing - Ida Rolf
The Hand - Frank Wilson
Balance, In Search of the Lost Sense - Scott McCredie
Master Cheng's Thirteen Chapters On Tai Chi Ch'uan - Cheng Man-ch'ing