Just in case you thought NEC was done with its PC updates this week, the Japanese PC builder has thrown its hat into the Ultrabook ring with a unique contribution of its own. The LaVie Z has a 13.3-inch screen like your garden variety ultralight, but it weighs just 2.2 pounds through a new lithium-magnesium alloy shell about half the weight of the aluminum that some companies love to use. Unfortunately, that weight and the slim fr
