Bloggingheads.tv

Not a libertarian site per se, this site often features video pundits holding libertarian viewpoints.

From their about page:

Bloggingheads.tv was started in the fall of 2005 by Robert Wright, Mickey Kaus, and Greg Dingle. Wright and Kaus, both journalists, had long been attracted to the idea of pontificating on TV, but so far few if any TV producers had seen merit in this aspiration. Wright and Kaus wondered whether the new economics of the Internet—which had already turned thousands of not-very-good writers into print pundits—could turn two not-very-telegenic people into video pundits.