Despite one recent contrarian, almost all market analysts expect Apple's stock to just keep rising into the stratosphere. Today the company's market value briefly hit $600 billion, with their stock trading at 644 before falling back to around 630 at midday. Only one other company has ever broached $600 billion mark: Microsoft reached that lofty figure for 13 trading days at the height of the dotcom boom. Today its valuation is $260 billion. And there seems to be no end in sight for Apple's soaring stock, with the iPhone 4S still selling well and poised to make dramatic gains abroad, especially in China.