Filed under: LaptopsAlthough late in arriving, Sony appears ready to join the low-cost, ultra-portable, netbook, mini-laptop party. An apparently generic prototype based on the Via OpenBook was just spotted at the Quanta booth at WiMax Expo. It seems that a quick check of the properties revealed a 1.6GHz Via C7-M processor and more interestingly, Sony as the manufacturer. When the Quanta exec demonstrating the box noticed "he quickly closed the properties window and declined to explain."