You can see if people are hanging out in the #boo channels:
GimpNet network: irc://irc.gimp.org/boo
Codehaus server: irc://irc.codehaus.org/boo
If no one is there, please try the Mailing Lists.
There are many popular IRC clients out there.
On Linux there are clients like Gaim, XChat, BitchX.
On Windows there is Gaim, Trillian, X-Chat, mIRC.