The MacBook Air led to Intel's Ultrabook, right? Well, before the Ultrabook, there was the Samsung Series 9 notebook, which was launched in 2011. Samsung's sleek, ultrathin Series 9 notebook is essentially the PC equivalent of the MacBook Air; it measures just 0.64 inch and weighs less than 3 pounds, making the Series 9 not only one of the slimmest and lightest PC notebooks around but one of the best-looking as well. The dark chassis is composed of duralumin, which Samsung says is twice as durable as aluminum and is the same material used by an "advanced aircraft." Advanced, indeed.