Acer's Aspire S5 notebook opened up

LAS VEGAS--Acer debuted what it says is the "world's thinnest Ultrabook," the Aspire S5.

The 13.3-inch notebook, which was presented by the company just ahead of this year's annual Consumer Electronics Show, comes in at 2.98 pounds and measures 15mm at its thickest point

The hot new feature, besides the size, is a MagicFlip I/O port panel, technology that hides the notebook's various ports when not in use. On that list is USB 3.0, HDMI, and a Thunderbolt port.

Click through to see more shots of the notebook, which Acer says will be shipping in the second quarter of 2012.