Inventors won't leave pointing devices alone. Just because the computer mouse is one of the simplest input devices that worked perfectly well the day it was born doesn't mean you can't reinvent it endlessly. One of the latest variants comes from Gyration, whose Ultra Cordless Optical Mouse looks at first like many others: a radio link replaces the cable, it uses rechargeable batteries, and optical sensors detect motion across a flat surface. The difference comes when you lift it up: it carries on working. Wave your hand around as much as you like, and the on-screen pointer will carry on tracking your hand movements.