Conspiracy theorists, would-be hackers, and cubicle sharers will all appreciate this little device. The Screen Keeper turns off the computer monitor when you walk away from your desk. A clip-on transmitter sends a signal to a receiver near the computer when you reach a preset distance away -- say, 10 feet (or about 3 meters). When you come back in range, the screen fires up again, no password re-entry required. The user sets the distance, so the screen could go dark as soon or as late as they like. Keeping sensitive data (or a novel in progress) safe from prying eyes will cost Santa about $30 [source: Screen Keeper].