Written in short, digestable chapters, Wolfe Lowenthal describes in full candor his life altering experience of learning Tai Chi with Cheng Man Ch'ing in New York City in the 60's and 70's. Highly recommended:

There Are No Secrets

And the sequel to 'There are No Secrets':

Gateway to the Miraculous

For those interested in seeing a lot of photos and diagrams for executing the 37 movement form I highly recommend this detailed classic. Many copies were issued, the hardback book is often inexpensive and worth-while:

T'ai-Chi: The Supreme Ultimate Exercise for Health, Sport, and Self Defense

Thirteen essays on Tai Chi and a detailed description of the 37 movement yang form from Professor Chang Man Ch'ing

Cheng Tzu's Thirteen Treatises on T'ai Chi Ch'uan

A primer on standing meditation by Master Lam Kam Chuen.

The Way of Energy

And also by Master Lam Kam Chuen, a primer on Feng Shui with simple and effective watercolor illustrations of the movement of energy:

The Feng Shui Handbook