As expected, CBS has launched "innertube," its ad-supported broadband channel of original web content, companion shows to CBS TV shows such as "Survivor" and "Big Brother," and eventually TV rebroadcasts of old and new shows once a deal is worked out with network affiliates, writes ClickZ. Ads on innertubes will be sold separately; advertisers buying TV spots have already bought ads on the broadband channel.

Inventory will be made available at the upfront, according to president of CBS Digital Media Larry Kramer. "Every discussion we have with major advertisers includes interactive opportunities. Advertisers are looking for 360 degree coverage, and so are we," Kramer said.

Units will include 15- and 30-second in-stream ads with display ads alongside, mostly priced as CPM buys, according to Kramer. The original ads in the shows will be replaced with new ones sold for innertube.