MacPorts has an official IRC channel on the FreeNode network. Join developers, power users and fellow-travelers in

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#macports on FreeNode
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[irc://irc.freenode.net/#macports Join with an IRC client] or [http://webchat.freenode.net?channels=%23macports use FreeNode web chat].
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Note that the users on IRC are dispersed across multiple timezones around the globe and might have day jobs, so don't get frustrated and leave if nobody answers right away. Hanging around and waiting a couple of hours will usually get you an answer. And if it doesn't, there still are our [MailingLists mailing lists].