SAN FRANCISCO -- Reaching into a large yellow envelope, Apple CEO Steve Jobs on Tuesday introduced the thinnest laptop his company has ever produced: MacBook Air, which is a mere 0.16 inches thick at its thinnest point. Despite its small size, the new computer features a full-size keyboard with an ambient light sensor, a 13-inch display with LED backlighting, a built-in iSight camera, and a multi-touch trackpad that allows users to, for example, use the iPhone's pinch gesture to enlarge and shrink...