The He Lives blog has a very timely review on the theology of Satan. As always, very well done.
It makes an excellent point about neither over- or under- estimating Satan. Satan is real, but not all powerful. Also, Satan is not in a "battle for souls". Hell is the punishment for sin (breaking God's laws), not part of any "deal with the devil" or "victory for Satan".
Which reminds me that I saw the new television show "Reaper". I found it pretty well done. There was good humor and some interesting plot. The premise is the main character's (a 21 year old) parents sold his soul to the devil (where did this meme come from? Faust?). Now the devil wants him to go around recapturing souls that have escaped from Hell. He has some super powers to help him out. I give it a big zero for Christian theology :) It also contains some course language (not counting the word Hell, which apparently earns my site a PG-13 rating :).