Someone over at the Straight Dope message boards asks for help identifying a novel set in a post-apocalyptic world reduced to primitivism, where the rulers use technology (lasers) disguised as magic (wand-blasts). Oddly enough, that could describe many books.

The most awesome thing on the internet is when people post a vague, rambling description of a science fiction story they read, or saw - and most of the time, amazingly, someone identifies it.