Conversation so far:
What were the regular segments?
There is a frequent (previously biweekly and weekly, but now less frequent) diavlog matchup between the two co-founders.
Who were the cofounders?
Robert Wright and Mickey Kaus.
Around what year did these take place?
CANNOTANSWER.
Did they ever have featured guests?
Many well-known people in the science community were a part of Science Saturday.
Any example names?
Michael Shermer of Skeptic Magazine, biologist PZ Myers, Craig Venter of the Human Genome Project, aging researcher and biogerentologist Aubrey de Grey, and philosopher David Chalmers.
Were these segments well received?
four high-profile science bloggers who had previously participated in Bloggingheads.tv discussions publicly distanced themselves.

Question: Why?
Self-contained rewrite: Why did four high-profile science bloggers chose to distance themselves from ?