I recently heard about a new breed of mouse called "Rollermouse." It is well known that the conventional mouse gives the user pain after many hours of use, which may even lead to tendinitis or repetitive strain injury. But there are jobs where a mouse is required, for example, graphic CAD design.
Apparently, there are several inherent ergonomic design problems in the conventional mouse. First, the palm down facing desk position of the hand is unnatural. Second, when the user reaches out to his/her left/right to grasp the mouse, the arm is extended and strained. I'm not sure if the Rollermouse solves the first problem, but it addresses the second -- the mouse is right next to your thumb when you are typing on the keyboard. It's an interesting idea, good enough that PC World gave it an award for one of the top 100 PC products of 2005. I may give it the Rollermouse a try someday, particularly if its price drops.
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