We have a number of articles on Tai Chi and the forms we use in PDF format. Feel free to download and read through them all
Tai Chi Commentary
The Spirit of Tai Chi
The Amazing Power of Sung in Taijiquan and Qigong by Tony Henrys and transcribed by John Gent, February 1992
An Introduction to Mr Wang Zhigang, The Director of the Wu Dang Secret Fist Qi Gong Scientific Research Association