Having reinvented portable music players, Apple’s setting its sights for its next extreme makeover a little closer to home. The so-called Mighty Mouse — equipped with a 360-degree scrolling ball, touch-sensitive shell, and programmable top- and side-mounted inputs — proves yet another marvel of engineering. Offering multibutton functionality for Macs and for Windows-­compatible PCs, units are housed within a single seamless (and stylish) all-white casing. $49. www.apple.com