WordPress:WPMU IRC Channel
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There is an IRC channel dedicated to wpmu. Join #wpmu on irc.freenode.net with your favourite IRC client.
One easy to use IRC client program is Gaim.
It is useful because people can answer your question more quickly and interactively, so it might be fruitful to ask there first or simultaneously with a posted question on the WordPress:WPMU Forums. If you do so, posting a link to the forum question in the irc channel would be convenient for others.
The channel is logged, so mind what you say if you mind that others might mind what you say.