One reaction I have to the articles, videos, and other materials is: where are women? One woman's name was on an article, most of the videos I found had all or mostly men. What does this mean about Permaculture? Something? Nothing?
At this point, a defining characteristic of Permaculture seems to be design - this infuses the various rubrics and areas of intentionality, planning, hope, experimentation, ethics, observation, etc. I appreciate the triumvirate of earth care, people care, fair share. A few months ago I watched - started watching but had to stop - a video by a 'successful' green farmer and he started it off with a bit on how he couldn't care less about polar bears; he was all about human success... and I was struck by how he was missing the big picture of what was, essentially, care and share!
Other philosopihies or approaches that Permaculture seems similar to: biodynamics and the Natural Farming work of Masanobu Fukuoka (One Straw Revolution and Sowing Seeds in the Desert).