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Apple boss Steve Jobs has made his first public appearance since a liver transplant this year.
The notoriously private head of the American firm won a standing ovation as he walked onstage to introduce its latest products.
"As some of you may know, about five months ago I had a liver transplant," he told the crowd in San Francisco.
"So I now have the liver of a mid-twenties person who died in a car crash and was generous enough to donate their organs. So I'm vertical, back at Apple and loving every day of it."
Mr Jobs, 54, who underwent the procedure in a Tennessee hospital, urged the audience to become organ donors.
The chief executive was unveiling Apple's new Nano, the first of its iPod range to include a video camera.
The gadget, costing £115 for a 4gb version, also includes a pedometer to count the wearer's steps, and can link up to a website to track how far they have walked.
It includes an FM radio, which Apple has been criticised for not having in the iPod.
Mr Jobs said the firm had sold about 100million Nanos, claiming that it was "the most popular music player in the world".
The company also updated its iTunes software, allowing users to post details of songs to Facebook and Twitter, as well as updating its iPod Touch line with cheaper models.
And there was a new version of the iPhone software, which promises users fewer bugs.
Mr Jobs said the firm had sold more than 30million handsets and attributed its success to the App Store which, he said, now has more than 75,000 applications which can be used on the phone. Around 1.8billion had been downloaded.
However, reaction to the new products was lukewarm.
"It's definitely an evolution rather than a revolution," said James Holland of gadget website electricpig.
"However, the addition of a video camera will really open up the iPod to people who want a cheap way to take video."
Mr Jobs claimed Apple was offering "video free".
