Richard Beck has been posting a series on Idolatry, Oppression and the Development of Demons. He has just posted part six. To read from the beginning (recommended), here is one, two, three, four and five.
He has made some great observations regarding the way scriptural evidence sends us, rather than as tradition has often made us assume. The posts are short and informative, especially if it is an area you haven't thought about much.
Kurt also blogs at Patheos.