ASUS is expanding its Zenbook lineup to include a larger 15-inch model. The company just announced the Zenbook U500, an Ultrabook packing some pretty robust internals. There's an Ivy Bridge Core i7 processor under the hood, along with an optional NVIDIA GT650M graphics chip and up to 512GB of storage. No word on weight yet, but the package measures 0.78 inches at its widest. The U500 also keeps in line with other Zenbooks' aluminum design, complete with the famous spun-metal lid. The 15-inch form factor gives the U500 room for a separate numpad on the keyboard (there's backlighting here, too). For storage options, you get either dual SSDs with up to 512GB capacity or the
