Meet the Kings of Content—our picks for companies creating and/or distributing the hottest, most innovative material around. Web newcomer YouTube and ever-expanding MTV Networks have a finger on the pulse of the influential young and hip, while HBO continues to produce edgy programming for mature audiences. All in all, these companies realize the importance of emerging media platforms and of letting consumers interact with their brands. Their payoff? The busy American public is finding the time to consume their content.