If you're still using the keyboard and mouse that came with your computer, we can give you plenty of convincing reasons to upgrade. The right desktop arrangement actually makes you more productive, and the wrong one can cause debilitating repetitive-strain injuries. So if all you really want to do is splurge on the newest and coolest devices, no one needs to know.

Mice and keyboards are constantly evolving. Mice that use a rubber ball to track movements, common just a few years back, are now nearly extinct, and highly precise optical mice have taken over. Keyboards now have a top row of media keys that control music and video playback, a sign that our computers have become digital entertainment systems as well as work machines. And though manufacturers have been cutting the cords and going wireless via RF for some time, more peripherals are Bluetooth-enabled, which provides better connections and smaller receivers. Here's a look at the newest input offerings.