Genachowski, a lawyer who worked for many years in Silicon Valley, is the most technologically aware FCC chairman ever to occupy the job. In particular, he understands what has made the Internet such a successful platform for innovation: It was designed to avoid favoring any particular application. In the few months since he took over the FCC, Genachowski has set a new tone for the agency, promising to rein in any companies that try to restrict what people can do on their Internet lines. In August, he surprised the tech industry by demanding an explanation from Apple for its rejection of Google Voice. Late in September, he argued for new rules to make sure Internet service providers obey the FCC's network-neutrality principles. In an interview with CNBC the other day, Genachowski was asked whether telecom companies should think of him as the new sheriff in town. The chairman dodged the question. But he's being modest: Genachowski didn't have to pass a single new regulation before carriers began to transform their business practices. Whether or not he wants to be known as the sheriff, they're already scrambling to avoid his six-shooter.