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A thin but energetic Steve Jobs made a surprise return to the spotlight on Wednesday, taking the stage to unveil Apple Inc’s new iPad and drawing a standing ovation.

The Silicon Valley legend has been out on medical leave since late January and his reappearance, in trademark turtleneck and jeans, bolstered Apple shares and reassured investors and fans worried about his health.

Defying speculation in some tabloid reports that he was seriously ailing, Jobs took swipes at rivals and mocked competing tablet computers. Striding back and forth across the stage at the Yerba Buena Center, Jobs spoke passionately about the iPad 2’s features as No. 2 and heir apparent Tim Cook looked on.

The $499 device is thinner than the iPhone 4, twice as fast as the last tablet, camera-equipped, and ships March 11 in the United States and March 25 in 26 more countries. The surprisingly fast roll-out highlights the fierce competition in the tablet market.

‘We’ve been working on this product for a while and I just didn’t want to miss today,’ Jobs told a packed auditorium in San Francisco with his characteristic flair and energy.