I have updated the pages I have on Magic in the Middle Ages. Some of these have been re-ordered, but I have also added new content, including excerpts from some primary sources. In particular I would recommend checking out the Peter Lombard page, he had quite a bit to say about the nature of angels and demons.
I am adding content as I get a chance whilst researching background for my novel Hell has its Demons. Hope some of you find this information useful!