There is a pretty great Five Element Clinical Reference mobile app for the iPhone.
It explains the theories and treatment protocols as set by JR Worsley.
It has been a great little reference for me in the clinical setting. I am trained in TCM, so it is nice to have the reference because I cannot always remember the Five Element treatments.
It is a MUST HAVE reference for students and practitioners.
Here is the link to the itunes store to purchase - or you can just search for "Five Element Clinic Book" in itunes.