That wasn't the part I was disputing, it was the IM/notifications thing.
Actually, if we make a permanent "Podcast" room and invite everyone who's interested, chat is persistent and stuff that's posted while you're offline comes up when you log on. I'm not too sure how it behaves when people in the room are in a call though. Besides, do we want people dropping freely into the podcast while it's being recorded? If someone's late or wants to join after it starts for whatever reason, surely it would be better to co-ordinate that with the people in the call and be invited when they're ready? That can be done fine via Skype.
And I'm not saying G+ isn't perfectly viable, I don't really know the mechanics of hangouts so I can't pass judgement on that. I'm just not sure what's so bad about Skype.