An important original e-book on a neglected subject:

Lilin Chen, Playing with Direction and a Sense of Structure: A Manual for Teachers of Pre-College Piano Students (published June 2010, price $25; file size 22.58 MB)
     Conveying direction and a sense of structure is an essential part of piano playing, but it has been surprisingly neglected in books and articles about piano teaching. In a substantial new book of almost 300 pages, containing more than 200 musical examples, Dr. Chen takes the reader systematically through what it takes to teach this aspect of piano playing, from the beginning stage through advanced. With the exception of the sections on fingering and pedaling, the book will also be helpful for teachers of other instruments.