Mike wrote a recap and they started posting videos.
http://www.insomniacgames.com/core-dump-recap/
They lost audio for the last four talks on day 1 Fortunately day 2 has everything, because day 2 was
really good.
youtube-dl has an --extract-audio option, doesn't it? I haven't tried, but I assume there's some way to automate that without too much headache.