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The quirky little start-up that once printed money by mailing you DVDs is hell-bent on morphing into the HBO—and the network, and the any-show, any-time streaming service—of tomorrow. Can Netflix and its pathologically modest founder, Reed Hastings, pull it off? Who knows? But it's going to be fun to watch, starting this month with David Fincher's $100 million House of Cards. The only guaranteed winner in the bloody battle for the on-demand future? You. On your couch