I have taken some Tai Chi classes and had a chance to see Chris Pei teach when he was here. A truly great teacher.
I had not looked at Qi Gong, but when seeing this video was available, I decided to purchase it.
In this he teaches the 8 routines which are called the 8 pieces of brocade. Each of the routines offer their own benefits of stretching and movement, and he explains the tradtional descriptions of what each routine accomplishes ahead of time.
Carefully laid out and makes a wonderful beginners DVD for Qi Gong. He also adds extra routines as a bonus.