There are now hundreds of links to written material and videos relating to tai chi and chi kung available online, and I recommend doing your own hunting around. Here I list a few which I think fit in well with my teaching at reCentre-Health.
Here is a video of dr Chi Chiang Tao performing the short form, pretty much as Hamid does – although, remember that everyone’s tai chi is his or her own.
Each year more and more historical videos, usually very poor visual quality, of Cheng Man-Ching. Here is a site with a little compilation of links to YouTube videos.
Glyn Williams has posted a number of instructional videos here.
This video shows a simplified version of the form, in a more ‘theatrical’ style, but still maintaining the basic principles of Yang style tai chi. I call it the Pink Lady Form.
I will be adding more links; for now this page is more or less a place-holder.
Do let me know when any of the links dies.