I've been lurking and enjoying the podcasts for a while. This seems like a good opportunity to out myself:
http://ecolutionist.com/2012/05/04/q-a-with-radical-ecologist-nance-klehm-on-urban-foraging/
Nance Klehm teaches urban foraging, tincturing, salve-making, and a host of other skills. She also has an occasional column, "Weedeater", in Arthur magazine. I have attended many of her forage walks, and always walk away with new knowledge and insight into my relationship with the plant world.
Paul Dickinson