If you haven't read The Screwtape Letters, you should! It's a brief, witty, thought-provoking book.
And if you live in the DC metro area, consider going to the theatrical version (December 16-January 3). I saw the production last year and enjoyed it so much that I organized a group outing through the boys' school.
The show's not just for "hard-core" Christians,either--C. S. Lewis's insights into human thought and behavior are enjoyable for all but the most ardent atheist.
More info from the Fellowship for the Performing Arts:
"C. S. Lewis’ brilliant novel, The Screwtape Letters, explores the theme of spiritual warfare from a demon’s point of view. When first published in 1942, it brought immediate fame to a little known Oxford don whose field of study was medieval English literature. Its wit and wisdom have made it one of C. S. Lewis’ most widely read and influential works.
Fellowship for the Performing Arts has adapted and produced this best selling classic into a thoroughly engaging and entertaining ninety minute theatrical production.
Set in a strikingly eerie, elegant and austere office in Hell, the play follows an ironic senior devil, Screwtape, who is equal parts charming intellectual, urbane psychologist, and cutthroat psychopath - and his secretary, Toadpipe, a creature who transforms instantly into recognizable figures with whimsical movement and wordless wit.
The mission: To instruct a novice demon, Wormwood, on the fine art of tempting a young Christian away from “the Enemy” (Screwtape’s name for God) and bring him safely down to the ravenous “our father below.”
Beloved by both audiences and critics alike, the stage version of The Screwtape Letters by C. S. Lewis offers an entertaining and provocative theatrical experience that will change the way you think about the influence of demons in your every day life."