First, we have a ventrilo server that AWU and Mammon are on quite often.
uranium.typefrag.com
port 16677
password: pathfinder
second, the NWN2 IRC is up and running and mammons in there almost all the time.
irc.nwn2source.net
port 6667
channel #nwn2cr
I'll see about getting a City of Rookroost channel set up soon (not a huge priority until we get more volunteers). The main nwn2 channel is a great resource for any questions and answers you might have about almost anything nwn2 related (including toolset questions).