Kensington promised us that the SlimBlade Trackball would turn us into "smooth operators," and we certainly felt retro behind the ball -- we hadn't used a trackball since the original Kensington Turbo Mouse. Muscle memory issues and a loss of efficiency drove us back to our trusty MX Laser after just an hour or so, but overall the Slim Blade is a nice little peripheral with some slick drivers -- mode changes pop up in an HUD, and spinning the ball latitudinally works like a scroll wheel -- so if you're a trackball fan, the gallery below is probably worth a long look.Gallery: