Below is a list of links you may find interesting.
This website is from the creator of the Shibashi Qigong sets I have added to my classes. Shibashi means 18 movements. These are repetitive arm and breathing motions that help range of motion in joints and assists with breathing issues. All of my students enjoy these sets. The website also offers a link to instructor workbooks at no charge.
Dr. Paul Lam's website for the Tai Chi for Health organization. It features links to short videos of the forms; where to purchase DVD's and other training materials; upcoming instructor programs; and the newsletters.