Google, Inc. (NASDAQ: GOOG) recently has had a knack for releasing software products that challenge -- and even threaten -- entire industries. Take, for example, last week's enhancement to Google Maps, which caused the stock prices of GPS companies TomTom and Garmin to plummet after Google announced its own GPS service that, in many ways, was a superior product. Yes, it's free with a Google-powered phone. What's next? How about real estate listings?
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