Lenovo this morning became the first company to release a computer in the newly coined smartbook category. The Skylight has the 10-inch screen of a netbook but uses a 1GHz Snapdragonprocessor that lets it defy a number of expectations compared to an Atom-based system. It not only gets about 10 hours of real-world use but is thinner than some smartphones, weighs less than 2 pounds and can play HD video, even when in a web browser.