Steve Jobs resigned as CEO but staying on as Chairman of the Board, still a pretty big position. The stock took a dip in after hours but not as bad as when he announced he was taking time off because of his health. He still has the same people that he handpicked to be there and continue his vision. I know he has been "Apple" but that company is so strong it's hard to imagine it toppling, especially with China mobile in the works and so many other products. Steve Jobs would not completely step aside and watch it all crumble, he's so much smarter than.
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