It will cost $1,799 in that configuration, and shipments are expected to start in two weeks. The MacBook Air weighs about 3 pounds, comes with 2GB of standard memory, an 80GB standard hard drive, and 802.11n wireless connectivity. Most ultraportable notebooks have miniature keyboards and 11-inch to 12-inch screens. It's so slender, Job said, it fits into an inter-office mailing envelope. The computer measures 0.76 inches at its thickest and 0.16 at its thinnest. Jobs said the MacBook Air has a 13.3-inch LED backlit screen and a full-size keyboard.

In addition, he announced Mac Office 2008 a backup appliance called Time Capsule and new features for the iPhone, iPod Touch, and Apple TV. Jobs also introduced a movie rental service ( watch the video), which he said has the support of all major Hollywood studios. Apple CEO Steve Jobs once again managed to impress a Macworld crowd during his keynote address Tuesday morning by introducing an ultrathin laptop called the MacBook Air, which the company touts as the world's thinnest notebook.

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