I’ve just confirmed the AllThingsD and BusinessWeek report that Quincy Smith, the one-time investment banker turned digital guru, is leaving his job in January as CEO of CBS Interactive to start his own consulting firm. (Back when he was venture capilatist and then investment banker with Allen And Company, Smith advised Google and Comcast.) Smith will continue to provide consulting services to CBS. Since joining CBS in early 2006, Smith has been Les Moonves’ top new media advisor who counseled CBS to keep its distance from Hulu.com unlike NBC, Fox and ABC. Under his guidance, the company has been building its own TV distribution arm through its TV.com site. Smith also was a key architect of the $1.8 billion acquisition of CNET last year. At CBS, he is CEO of the unit that includes CNET sites as well as the cbs.com and cbsports.com that distribute shows from CBS’s existing businesses. Smith was also a key driver behind CBS’s efforts to stream high-end sporting events, including the annual Final Four college basketball tournment games.