If anyone is interested, Adoray has written a google doc with instructions on how to join. There are usually several of us in the chat (5 at the moment).
. Note that this method was never updated to the Rizon server, so it will dump you in an old Nightstar server as of my checking the functionality on 1/1/2017.
If you want to chat on IGS, just go to: https://indiegamestand.com/chat.php - easy chattin for IRC n00bs
Later posts indicate that support of it will be better soon, so consider it in beta (right now I think there is a user cap and I've noticed some browser support issues with Chrome). In a week or so, I think it will have better integration and support.
December 2015 - We moved to Rizon awhile back. Everything is the same, but instead of Nightstar, it is Rizon.
channel is indiegamestand