Google plus hangout
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One idea that might be easier than a podcast (if people don't mind that it's not edited) is a Google Plus hangout, not unlike what Phil Plait does with Bad Astronomy each week. He has people hangout (but not actually chat with him) and answers questions in the comments. (He also records at least parts of them, for example here. I guess it depends a bit if you want to have prepared material or questions, etc., and how "refined" you want them to be.
This would be interesting, and certainly I know a few of us might be interested in something like Blogging Heads, though we'd have to consider what that would do to the pseudo-anonymity aspect of the wiki.
True, although I think the anonymity issues aren't as much of a concern to many people as they used to be, when the interface with CP was more relevant.