The CruiseControl.NET Team as well as many members of the user community can be found online in the ccnet Jabber conference room on conference.jabber.rootbash.com.
The chat room can be accessed with any Jabber/XMPP client that supports Multi User Chat (MUC).
XMPP Jid: xmpp:email@example.com
These are some of the popular desktop IRC clients:
A web interface to the ccnet Jabber conference room can be accessed on the Silverlight group chat page.