Twelve South is maintaining its record of success with Apple-only accessories with a new twist on an existing product. The company has made soft leather pads for the area around the trackpad on a MacBook Pro for several years; now they're shipping a MacBook Air-specific version of their venerable SurfacePad product.
SurfacePad for Air (US$29.99) comes in sizes to fit the 11" and 13" MacBook Air