Acer is attempting to claim the title of thinnest PC notebook in the world with the unveiling of its two new ultrabooks at the 2012 CES. While the full specifications of the Aspire S5 and Timeline ultrabooks are still being released and solidified (at least to the press) the S5 is being billed as the thinnest ultrabook to date at only 15mm thick. For reference, the current MacBook Air is 17mm in thickness. Weighing in at less than 3 pounds, the S5 features a 13.3" LED backlit LCD screen and an unusual motorized "Magicflip" panel that opens to reveal the included HDMI, USB 3.0 and Thunderbolt ports. This is the first notebook we've heard of to-date that features Thunderbolt aside from Apple products, though we imagine this will be more commonplace at CES this year. Discuss "Acer S5 and Timeline Ultrabooks Preview" here. Read the article.