Bob Costas sat in with Dave Fleming for a half-inning tonight on KNBR, and apparently Al Michaels did the same w the TV side. They're in town b/c they'll be doing tomorrow's game together for MLB network.
At some point tomorrow they will move over to do the Comcast broadcast for a couple innings while Kruk and Kuip move over to do MLB. I didn't know this, but Al Michaels used to do Giants games back in the 70s with Lon Simmons.
last night, Buster Posey sat in for an inning w the KNBR crew. He's pretty natural, very smart, and would make a good broadcaster/color guy if he learns to modulate his voice, etc, etc.