Twelve South is shipping the US$39.99 BookArc for MacBook Air. Designed exclusively for MacBook Air (late 2010 models), the latest BookArc firmly grips the thin MacBook Air and includes built-in cable management to keep desktop and power cables in place.

Like previous versions of the BookArc, the MacBook Air model is fashioned from heavy gauge steel. One addition is built-in cable management. Since MacBook Air has inputs on both sides, the BookArc cable housing routes power, external display, USB and other cables behind the MacBook for a clean workspace.

For those who use MacBook Air with an external display, a key benefit for BookArc is the performance boost it gives your Mac, according to the folks at TwelveSouth. If you connect MacBook Air to an external monitor and leave the MacBook open, video memory is split between the two displays. When working with MacBook Air in the closed position, resting in BookArc, 100% of the video memory is dedicated to powering the external monitor. This provides a notable boost in power when working with Aperture, Photoshop and other graphics- intensive programs, says Twelve South.

A soft silicone insert on the BookArc firmly grips the second generation, 11-inch and 13-inch MacBook Air. Padded rubber feet keep the stand from leaving any marks on your work surface.