There is a permanent #Erfworld channel open at irc.tellaerad.net. Point your IRC client there, or you should be able to connect through most browsers by clicking here:
http://arcadia.tellaerad.net/erfworld.html

or try

irc.tellaerad.net port 6667 in your IRC client

Rob will be in there from time to time as RobTitan, usually saying more than he should about Erfworld. The ONE RULE of the room (other than don't be a dick) is that you may NOT quote what he say as Word of God. There's a lot of thinking out loud. Anything Rob say in there is not canon, and may be changed, ignored, or totally reversed. Also there are a lot more questions Rob won't answer than ones he will. Don't go there for Rob, go to hang out with other Erfworld fans.