The XO laptop is back with a new look and a new design, at least in theory. Nicholas Negroponte unveiled photos of the upcoming XO-2 device this week, with an announcement that the revamped computer would be ready for delivery by 2010 and carry a price tag of $75. Gone is the green plastic keyboard, replaced instead with a second touch screen. The device can be opened to function like an electronic book, or it can be rotated to a more traditional laptop configuration, with the new screen assuming the role of virtual keyboard. This flexibility is meant to encourage collaborative learning and play, so that more than one child can use the computer at a time.