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).
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