I have a lot more to say about pitching than I discuss on my Pitching Mechanics 101 DVD. However, and for a variety of reasons, I believe that supplementary information doesn't belong on the DVD itself.
Some instructors have tried to solve this problem by embedding their supplementary information in posts and threads in their client-only message boards. In my opinion that approach doesn't work well for most people -- for people who aren't completely obsessed with hitting -- because it makes finding critical information a difficult and time-consuming process. I have decided to organize my supplementary information differently into a set of webbooks.
In order to make it easy for my clients to be able to keep track of what I'm working on, I have duplicated the tables of contents of my different webbooks in my Pitching Master Index.