Yin Cheng Gong Fa has published a new book:
The Taijiquan Classics - The Essential Translation and Explanation with Commentary on History and Culture by Zhang Yun, David Ho, Peter Capell, Susan Darley. YCGF North America. (ISBN: 978-0-578-17886-8)
For the last ten years, Zhang Yun and three of his senior students have been working on a translation, with commentary on history and culture, of the Taijiquan Classics, which are core writings detailing the philosophy, principles, and practice of Taijiquan.
I have been avidly reading this book since I received my copy and recommend it without hesitation to practitioners of Taijiquan regardless of lineage or level of experience in the art. It contains English language translations of a number of important classics with detailed expository content.
You can order a copy at the Lulu.com print on demand service. Here is the description from that site:
Taijiquan is one of the most widely practiced and least understood martial arts in the world. Many people no longer practice Taijiquan as a martial art. Of those who do, few outside of China have had the opportunity to read and understand the Classics of Taijiquan as the canon of the art. If there were scriptures pertaining to Taijiquan, the Classics would be those. The Taijiquan Classics serve as a fundamental reference for all serious students of Taijiquan. For non-Mandarin speakers, this book is the first complete compilation of the Classics in English, including clear and precise explanations of the essential concepts of Taijiquan. The Classics provide deep insight into Chinese culture generally, with descriptions of the teachings of Daoism that have guided a people over millennia. We hope that readers of this material will appreciate the depth of its content and the effort that was required to bring it to the level of clarity provided within.
I recommend the book highly!