CNN.com has taken notice of the Huffington Post and the Daily Beast as "opinion destinations" and wants a "horse in that race," CNN.com General Manager KC Estenson told me last night, after the industry introduction of the revamped cnn.com site. At an after-event party at the Hudson, we sat down for this chat. He said that Arianna Huffington and Tina Brown, founder of the Daily Beas, had done a "really nice things" with their sites. He said that CNN.com already has a stable of 100 contributors, both inside and outside CNN, and wants to build out the effort by surfacing them in a new page called CNN Opinion, which goes live on Monday as part o the site redesign. He said he plans to add as many as 10 new contributors a month.He said that in addition to the text contributions, CNN.com will feature videos of the contributors -- sometimes produced and submitted by the contributors and others produced by CNN.com. Last night, CNN announced three new contributors, conservative commentator David Frum, actor John Leguizamo and social media blogger Pete Cashmore. Andy Plesser, Executive Producer Less