Those USB pens are the absolute fear of security folks. They are so easy to use, require no software, and aren't easy to recognize. In fact, at the place I work... a government installation... we are moving to a stronger public/private key security system, where we have to put our ID card into a computer to sign onto the network. Until the system is base wide, the higher ups have been given a USB key they have to use. Which looks just like a USB Pen Drive. So, the people who keep stuff from disappearing are hating it.