After almost a year of agonizing posturing by Sony, the semi-flexible 13.3-inch Digital Paper has finally been unveiled. For $1100, you can get your hands on the thinnest, lightest A4-sized e-ink tablet. The Digital Paper supports stylus input, has built-in WiFi, and lasts up to three weeks on a single charge. The key technology here is the new Mobius display from E Ink, which is very light and highly flexible -- though it isn't clear how much of that flexibility made it into the final Digital Paper product.