I swear by the Logitech Trackman Wheel. What I love about it is that you're controlling the cursor with just your thumb. With a mouse or a trackpad, you're al

I swear by the Logitech Trackman Wheel. What I love about it is that you're controlling the cursor with just your thumb. With a mouse or a trackpad, you're always using your wrist or your shoulders. Granted, that my not be an issue for most people, but I have issues with my wrists and the trackball has been a huge boon for me. I own one with a cord and one that's cordless. The cordless one seems to have trouble registering on some surfaces, so I'd recommend the wired version, as its never given me any trouble. Finally, they run just fine under Linux, which isn't that surprising for a standard mouse.