I like Apple’s new Pro Mouse, but can see the advantages of a scroll wheel and programmable buttons. Contour’s MiniPro Mouse is dinky and has two buttons but no scroll wheel. With its tough case, it makes an excellent travelling mouse for iBook and PowerBook owners. With its three buttons and scroll wheel, the affordable Microsoft Wheel Mouse is a compelling alternative to Apple’s input device – I haven’t plugged my Pro Mouse back in. It’s let down on looks only; if this bothers you, go for the Explorer. As for the Trackball, I’ll leave that decision to the weirdos that like them.