Lenovo was first out of the gate with a form-shifting Windows 8 machine when it unveiled the IdeaPad Yoga at CES. Now the company's back with a convertible for its business customers, the ThinkPad Edge Twist. In many ways, it's a convertible in the most conventional sense of the word: unlike the Yoga, whose screen folds all the way back, the Twist has a 12.5-inch display that can swivel all the way around and fold down into tablet mode. As a member of the Edge
