No one expected Steve Jobs to top last year’s iPhone at his keynote speech at last week’s Macworld Expo. And he didn’t. But the Apple CEO did show off a set of products that will keep the Mac momentum going.

The fanboy crowd in San Francisco roared loudest at the MacBook Air. A gorgeous three-pound computer with a sleek aluminum skin, so thin that you could slip it under a door, it’s the Kate Moss of laptops. At $1,799 it has limited storage, a nonremovable battery and no DVD drive, but stylish road warriors will love it.

Jobs also announced iTunes movie rentals. All six major studios will offer their films for rental at $2.99 (for older films) and $3.99 (for recent releases, 30 days after the DVD comes out). High-def versions will cost a buck more. The rental process is the same as purchasing a song or TV show, but once you click RENT MOVIE you have 30 days to start a 24-hour window for watching the flick, either on your computer, iPod or iPhone.

Rentals will also work on Apple TV Take Two, a revamped version of the company’s not-very-successful living-room media server. The newer model is cheaper ($229) and doesn’t require a computer.

But maybe the cleverest new product is Time Capsule, a combination Wi-Fi base station and hard disk drive that automatically makes backups of your files that will be eternally retrievable using the Time Machine feature of Apple’s Leopard operating system. At $299 (for 500 gigs of storage) or $499 (for twice that—a terabyte!) it just might save your skin one day.