Windows 8, which Microsoft unveiled last week at its BUILD conference in Anaheim, is notable for many reasons. But the single most striking thing about the upgrade--which won't show up in shipping form until well into 2012--is its all-new Metro interface. As Microsoft says, Metro is "touch first." You can use it with a keyboard and mouse, but any Windows 8 PC that doesn't have a touchscreen is going to feel a tad retro. Microsoft is clearly looking towards the day when touch is as standard a PC feature as sound and a Webcam are today.