Conversation so far:
What were the regular segments of the Bloggingheads.tv show?
There is a frequent diavlog between the two co-founders of Bloggingheads.tv, generally related to politics in some form, that usually occurs on either Wednesday or Thursday.
Who were the cofounders of the Bloggingheads.tv show?
The two co-founders of the Bloggingheads.tv show are Robert Wright and Mickey Kaus.

Question: Did they ever have featured guests?
Self-contained rewrite: Did the Bloggingheads.tv ever have featured guests?