Just when you thought things couldn’t get any thinner, Apple busts out the new MacBook Air. Announced today at Macworld in San Francisco, this world’s thinnest notebook ever weighs only 3 pounds and fits inside a manila envelope. With all your favorite features, like an iSight to do your make-up in, and loads of other geektastic things - the base will run you $1799, and an upgraded version for $3098. Apple.com