Today at Macworld Expo, Apple announced their entry into the ultra-mobile laptop market. The new MacBook, aptly named Air, is only 3 pounds and has a 13.3″, LED backlit display. Air also has a full keyboard and a beautiful tactile trackpad which brings some of the iPhone familiar touch functionality to the laptop. The Air will ship with Apple’s Leopard OS, and starts at $1799.

Another big announcement from the Macworld Expo, was the newly launched ITunes Movie Rental store. The store launches today (US only), with over 100 titles, and has promised to deliver over 1000 by the end of February. Customers will be able to rent new releases for $3.99, and all other library titles for $2.99. Renters have 30 days to begin watching the movie, and 24 hours to finish watching it after it is started.