Ever since CEO Steve Jobs returned to Apple (AAPL) in 1998, his company has developed several watershed products and innovations that have reshaped the consumer personal computing and gadget markets. Some innovations, such as the MacBook, have merely been improvements to existing Apple products. But others, such as the iPod and the iPhone, have been truly revolutionary in the way they've reshaped consumer expectations for portable music devices and cellular phones. In this slideshow we'll take you through the past 12 years of major Apple innovations, all in anticipation of the expected debut of Apple's new "tablet" computer on Jan. 27.
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