Anyone lucid during the past 24 hours won't be particularly shocked to see the arrival of Lenovo's slick new all-in-one -- though the thing is officially becoming official a day before originally anticipated. Not surprisingly, the company's really playing up aesthetics with the ThinkCentre Edge 91z, calling it the thinnest AIO, at 2.5 inches -- and certainly its thinner than, say, the HP TouchSmart 610. The centerpiece of the system is that glossy 21.5-inch wid
