Ann Druyan and Nick Sagan were interviewed on the Galactic WaterCooler. The show runs 123 minutes long, so you might want to skip past the banter of the hosts where possible. There's unneccessary music added to the background in places, but the portion with Ann and Nick is worth listening to. Here's where the Sagan-oriented talk begins:

20:40 Talk of Carl's movie and book "Contact".
24:40 Ann Druyan with some history on the COSMOS series.  You get to hear a little on the background of how Cosmos started and behind the scenes details like how Ann got them to change the name from "Man and the Cosmos" to COSMOS. Later around 46:00 we hear how Annie got the Library of Alexandria inserted into COSMOS. They eventually transition to speaking with Nick.

A Glorious Dawn is mentioned at about 40:28 and 55:10.  Download the show as an mp3 file here.  Incidentally, Annie Druyan begins her podcast the week of Nov. 16th November 23rd.