One of my major interests, this. The more I study occult theory and weird fringe philosophy, the more it all just leads back to the seriously primal stuff. Sometimes my studies lead to a refinement of understanding as to why this stuff works, sometimes it’s just interesting to see the lengths people will go to to achieve the same thing while looking educated and refined.
But I digress: there’s a nice article on Shamanism just gone up on Barbelith. The article is a sequel to this one (which also has a rather good reading list for anyone interested in learning more) and I recommend them to anyone interested in an quick overview of this practice.