With its big rolypoly ball and huge hand rest, the venerable trackball mouse looks like a holdover from 1996. Or maybe 1946 -- that's the first time a trackball was used as an input device in a computer. Its popularity has waned since the introduction of the mouse and then the trackpad. And for good reason. Those devices take up way less space! But here's the thing: The trackball is still good. Not just good -- the trackball is great. So great that Logitech is introducing its first trackball in many years is a cause for celebration -- even if I have some issues with my new favourite input device.