Samba is discussed on two IRC channels on the FreeNode network(irc.freenode.net).
User questions about Samba can be asked in this channel. Please keep a few things in mind:
This channel is the equivalent of the samba-technical mailinglist. It is used by the developers to discuss Samba internals and development.
Note: This channel is for discussion about development issues only, not for questions about problems with Samba!
Stats and logs for both channels are available at irc.vernstok.nl.
Freenode has a couple of general notes about behaviour in IRC channels.