Maven Networks, a start-up based in Cambridge, Mass., raised $12 million in Series C funding for its platform for creating, managing and delivering broadband video channels. Maven Network's Maven Media System (MMS) enables media companies to design and launch professional broadband video channels, and generate new revenue streams. The Maven Media System has been used by customers such as 20th Century Fox, A&E Television Networks International, Disney Buena Vista Pictures, Hallmark Channel, National Geographic Channel, Pepsi, Nike, and Sony...