Steve Jobs had a tough act to follow today in his keynote speech at the Macworld Expo: himself.

Steve Jobs announcing iTunes' movie rentals.

Unlike in Macworld 2007, when the Apple chief unveiled the game-changing iPhone, Jobs' keynote today primarily centered on a new, ultrathin MacBook computer and the addition of movie rentals to the iTunes store.

Apple did provide software updates for the iPhone and the iPod Touch, although owners of the latter will have to pay $20 to receive the update.

The iPhone will now have the ability to send text messages to multiple recipients, make the handset's home screen customizable, and incorporate Google's Locate Me feature into the iPhone version of Google Maps.

Meanwhile, the iPod Touch update will add Mail, Maps, Stocks, Weather, and Notes features--essentially giving the music player the same capabilities as the iPhone, with the obvious exception of the ability to make and receive phone calls.

The Maps feature for both the iPhone and iPod Touch will let users find their current locations.

Jobs prefaced the software announcement with the latest sales figures, noting that Apple has sold 4 million iPhones since it first hit stores in June 2007.

The iPhone will also get the ability to support multiple soundtracks for different languages, along with subtitle tracks and DVD-style chapter marks. Those additions fit nicely with the most widely rumored announcement today, the addition of movie rentals to iTunes.

Apple is launching a movie-rental service to complement its TV and movie sales service as part of iTunes, and all major studios are onboard. Titles will be available 30 days after their DVD release, with users getting 30 days to start watching and 24 hours after that to finish watching.

iTunes will charge $3.99 for new releases and $2.99 for old titles. Apple TV, the set-top box Jobs unveiled last year, will get the same rental features without the need for a computer, although movie rentals will cost $4.99 each.