We very, very briefly had something like audio podcasts with video. I would fire up Miro (then Democracy Player) when I went to class, then come back to a bunch of videos downloaded via RSS's video containers from places like Revision3 and TWiT. All it lacked was a discovery platform like Apple Podcasts, though the player itself tried to provide discovery.

All the surviving shows have moved to YouTube. YouTube could provide the same sort of service, but it's not compatible with Google's dependence on ads.

Sort of, if a user has the same handle and post to all the major sites it works like that.