These products deal with the theory, knowledge and skills required to build, design and fly rockets. Some of them may not be directly geared towards the rocketry hobby, but deal with techniques used by rocketeers.
DVDs & CDs
Making Parts, Patterns, Tools & Molds
Which Way Do I Turn? (spindle turning)
Obviously there's a wealth of free information available online. Using that information can work fine. However, you often don't know who is providing the information and how skilled they are. The advantage of books and such is that you know exactly who is presenting the information.