As was just mentioned in the project's Wiki [1], there is now an official IRC channel for the project: #DeforaOS on the OFTC network [2].

Everyone is welcome to join and have a chat over there, even though of course it is primarily meant for discussions and support around the DeforaOS project.

[1] http://www.defora.org/os/wiki/1172/Support
[2] http://www.oftc.net/