BitTorrent said Friday that it raised $20 million in a second round of venture capital to help commercialize a popular open-source project for delivering media content, to encompass mass market content distribution services for large media customers.The San Francisco-based company added Accel Partners of Palo Alto, Calif., as lead investor in the round, joining DCM-Doll Capital Management of Menlo Park, Calif., which backed the company's $8.75 million first round of September 2005.    more....