Steve Jobs appeared in public on Wednesday at a company event for the first time since the co-founder and CEO of  Apple  received a liver transplant earlier this year, signalling he was back in charge and allaying some concerns about his health.

Jobs, was greeted by a standing ovation from the crowd in San Francisco, where Apple unveiled new offerings that included an iPod Nano with a video camera, and stressed the use of the iPod touch as a platform for videogames. Apple also dropped prices across its iPod lineup as the company tries to revive slowing sales.

The 54-year-old, wearing his usual black turtleneck sweater and jeans, was reported to have appeared thin and spoke with a scratchy voice, but showed energy and enthusiasm.

"I'm very happy to be here with you all,"Jobs said and explained that he had received the liver of a young adult who died in a car accident. "I wouldn't be here without such generosity," he said, urging others to become organ donors, too.

He added:"So I'm vertical, I'm back at Apple, loving every day of it."

Steve Jobs is credited with an inspired eye for compelling design and returned to work  in late June, following a nearly six-month medical leave. He was diagnosed with a rare form of pancreatic cancer in 2003.

Apple seized control of the mobile music market from Sony, which had launched the Walkman in 1979. It says the iPod is still the dominant digital music player, with nearly 74% market share. However, it has been eclipsed by the fast-selling iPhone. In the quarter ended June 27, iPod shipments dropped 7% and revenue declined 11% from a year earlier, to $1.49 billion.

Apple lowered the starting price of its iPod Touch device, which is viewed as an iPhone without phone capability, to $199 from $229. The new iPod Nano, starting at $149, comes with an FM receiver and pedometer in addition to the built-in video camera but no still camera.

Apple also introduced a new version of its iTunes software and online store. Among the new features: greater ability to share music and other digital content between multiple computers in a single home and a feature called iTunes LP, which brings additional content such as lyrics, videos and artwork to albums purchased on the site.

Steve Jobs interview with CNBC Sept 09, 2009: