Acer's first Ultrabook, the Aspire S5, also happens to be one of the first of what will certainly be a tidal wave of Ultrabooks announced at CES this year. It's just 15mm thick at its largest point, and weighs in at less than 3 pounds.

One of the ways it manages to stay so thin is with what Acer is calling a "Magical I/O port panel" which drops down just below the hinge, exposing an HDMI, USB 3.0 and 20Gbps Thunderbolt-which will probably be a recurring theme this year.

An Intel Core processor and an SSD provides power saving benefits, while the Acer Green Instant ON feature promises almost instant resumes from sleep. And by instant, they of course don't mean instant, but a respectable 1.5 seconds. Available sometime in the second quarter of this year, with pricing to be announced. [Acer]