Sorry if this book has been posted about before, but I found a great book on Chen style Taiji yesterday. Chen Style Taijiquan: The Source of Taiji Boxing by Davidine Siaw-Voon Sim and David Gaffney is an excellent book. Everyone interested might want to at least rifle through it at their local bookstore. Unlike many other Taiji books, this one feels like it was put together by people who are sincere about the art and more interested in spreading good information than making a quick buck.