Another vote for FreefallRC podcast - they do talk "planks" every so often, and even though I do skip some of the helicopter technical stuff on occasion, it's fun to listed to. Mike D's "Planker News Report" in the last year of FreefallRC is drive off the road, laugh till you're out of breath funny.
There is also a new ParkFlyer Podcast that's started up with a couple guys that's fun too.