Kind of a response to the Tri-State Area Foraging post, but thought it deserved it's own thread.
Rick and Doris Hamilton have an incredible body of knowledge on so-called 'primitive' skills and plants. They have one DVD finished on plants and are close to finishing up on another, covering edible, medicinal and other plants found on the Plains. They also host an annual knap-in and primitive skills get-together. Check out their web site for ordering information as well as details and location for the knap-in/skills gathering.

Disclaimer: I know Rick and Doris; they are great folks and extremely generous people. They are unaware that I am posting a link to their site. The only compensation I receive from them is learning from their experience.