Behind the Mac itself on the list of most important pieces of equipment to buy, I generally find the input device as the uncontested Number Two. It’s what you use to communicate with your Mac. When considering an input device in the design business (and probably audio/video editing), not only is comfort a consideration, but the feature set ranks pretty highly as well. Recently, I found myself wanting a new mouse and decided to dig out some of my old hardware and try out some new stuff. In this Macworld article I review Apple’s Mighty Mouse, the Kensington Expert Mouse (trackball) and Logitech’s MX Revolution.