This is the testimony of Roger Morneau, a man who was part of a Satan worshipping secret society. His conversion to Christianity and his escape from the occult is both fascinating and informative.
His story, A Trip Into The Supernatural, give some major insights into the connections between the "spirit world" and the events of current history.
This is a PDF transcript of A Trip into the Supernatural
Some videos of ladies in Michigan that were exposing spiritual formation. It was done quite a few years ago, but I think they have one of the best basic videos we have seen on the subject.