This week in pictures: The SOPA saga

Also: Barnes & Noble fights back against Microsoft patent claims; Buffett bets big on IBM; Google serves up Android 4.0 source code; Amazon ships Kindle Fire; and Nintendo builds life-size Mario Karts

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Warren BuffettREUTERS/Rick Wilking
Berkshire Hathaway Chairman Warren Buffett poses for a photo from behind the counter at the Borsheim's jewelry store during his company's annual meeting weekend in Omaha, Nebraska May 1, 2011.

Why Warren Buffett is betting big on IBM (and not Google, Microsoft or HP)
Warren Buffett always avoided tech investments, finding the long-term business models anywhere from speculative to dubious. Until this year. In an interview Monday on CNBC, Buffett revealed that his investment firm, Berkshire Hathaway Inc., has purchased $10.7 billion in shares of IBM since March, giving the company a 5.4% stake in Big Blue. So what made the legendary billionaire investor lay down a huge bet on Big Blue? It all started when he read IBM's annual report this year -- something Buffett says he has done every year for the past 50 years. This time, though, he had an epiphany.

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