Many users out there use the traditional mouse. Traditional in the sense it's not a trackball, however it's not to say there aren't any trackball users. Logitech once again tries to cater to the niche market and puts out their own optical trackman that is wireless. Dubbing it the Logitech Corless Optical Trackman (makes sense no?). Envy News has a review on this interesting piece of computer peripheral.

"There may be two distinctive input users, but it all falls down to what you prefer and which one you find to meet your needs; I haven’t heard of any repetitive stress injuries with trackballs – perhaps Logitech is working hard to create the ultimate input peripheral, but until then, we feel the Cordless Optical trackman still needs a bit of work"