Acer just announced the Aspire S7 series, which includes a 13.3-inch model and an 11.6-inch model, the first in the company’s Ultrabook lineup. The S7 Ultrabooks have screens that fold back 180 degrees, allowing the system to lie flat.  They are made of 12.5mm-thick unibody aluminum, sport backlit keyboards and “full HD” displays.  The 11-inch [...]