Apple CEO Steve Jobs holds an envelope containing the new MacBook Air during his keynote at the MacWorld Conference in San Francisco. The super-slim new laptop is less than an inch thick and turns on the moment it's opened. MacBook Air measures 0.16 inches (0.4cm) at its thinnest point while its maximum height of 0.76 inches (1.93cm) is less than the thinnest point on competing notebooks.

Apple CEO Steve Jobs unveils the new MacBook Air during his keynote at the MacWorld Conference in San Francisco. The super-slim new laptop is less than an inch thick and turns on the moment it's opened. MacBook Air measures 0.16 inches (0.4cm) at its thinnest point while its maximum height of 0.76 inches (1.93cm) is less than the thinnest point on competing notebooks

Apple CEO and co-founder Steve Jobs holds the new MacBook Air laptop computer as he delivers the keynote speech to kick off the 2008 Macworld fair in San Francisco. Jobs introduced the wireless Time Capsule backup appliance, iTV 2 and the new ultra thin laptop MacBook Air.

Apple CEO and co-founder Steve Jobs holds up the new Mac Book Air after he delivered the keynote speech to kick off the 2008 Macworld Conference and Expo in San Francisco. Jobs introduced the wireless Time Capsule backup appliance, iTV 2 and the new ultra thin laptop MacBook Air.

Apple CEO Steve Jobs holds up the MacBook Air after his keynote at the MacWorld Conference in San Francisco. The super-slim new laptop is less than an inch thick and turns on the moment it's opened.

Apple CEO Steve Jobs holds up the new MacBook Air after giving the keynote address at the Apple MacWorld Conference in San Francisco. The super-slim new laptop is less than an inch thick and turns on the moment it's opened.

A MacWorld attendee stands next to a giant poster of the new MacBook Air ultra thin laptop at the MacWorld Conference & Expo in San Francisco. MacBook Air measures 0.16 inches (0.4cm) at its thinnest point while its maximum height of 0.76 inches (1.93cm) is less than the thinnest point on competing notebooks.

A new MacBook Air ultra thin laptop sits on display at the MacWorld Conference & Expo in San Francisco. MacBook Air measures 0.16 inches (0.4cm) at its thinnest point while its maximum height of 0.76 (1.93cm) inches is less than the thinnest point on competing notebooks.

Apple MacBook Air is shown at the MacWorld Conference in San Francisco.

Attendees look at the new MacBook Air at the MacWorld Conference in San Francisco. The super-slim new laptop is less than an inch thick and turns on the moment it's opened.