Taijiquan - Body of Knowledge
This is a great little book that I picked up in a Oxfam Bookshop.
It covers the Cheng Man Ching form but it has a great set of preparation exercises (23in all) and sections at the end on breathing, pushing hands, tai chi in daily life and frequently asked questions.
The publisher is Pepper Publications PTE Ltd, ISBN 981-4097-09-8. Published in 2004