Acer America today announced the availability of the Acer Aspire S5 in the U.S. The world's thinnest Ultrabook, it measures only .044 inches at its thinnest point and weighs just 2.65 lbs -- about as thin and light as a pad of paper. In addition, the company's first Ultrabook, the Aspire S3, has been refreshed with a 3rd Generation Intel Processor, solid state drives and an elegant champagne color.

Acer Aspire S5 -- the World's Thinnest Ultrabook
The S5's delicately curved chassis is Onyx Black, and the cover rim wraps around the system body like a protective shell. A magnesium-aluminum alloy cover and palm rest provide a slim and sturdy design, while the metallic brushed detail provides subtle elegance. Clean and ultra-fluid contours from all angles make the S5 a vision of beauty.

Kicking off the CES release madness a little early, PC maker Acer has today announced its second ultrabook, the Aspire S5. Set for a Q2 arrival, the S5 is 15 mm thick, it weights under 1.35 kg, and features an Onyx Black magnesium-aluminum alloy cover, a 13.3-inch LCD screen, a chiclet keyboard, an Intel Core processor, a solid state drive, and a MagicFlip I/O port panel (found below the hinge) which includes HDMI, USB 3.0 and Thunderbolt (!) connectors.

Acer's ultrabook also includes the Green Instant On technology for super fast booting and resume, and the Always Connect solution enabling users to 'manage their multimedia and data on all their devices at anytime, anywhere'.

No word (yet) on the Aspire S5's pricing scheme.Images courtesy of The Verge.