Try as we might to live in a fully digital, paperless world, there is no escaping the need to print out documents every now and then. No problem if you're always in the office or at home where access to a desk printer isn't a big deal. But for a road warrior, that cramps not only style but also mobility. Brother's new PocketJet 7 series wants to do for printers what smartphones and tablets have done for phones and computers. To unhook these devices from their wires.