I have often wondered why NI's podcasts dried up. I still have it subscribed in iTunes, but nothing new for well over a year.
I would subscribe to a video podcast that is the webinar content. I could then at least listen on my commute and watch again over lunch if it sounds like it needs video. I already do this with some other things: geekbrief, makezine, etc. Granted, they are not really in depth project-based video podcasts, but I don't see why it wouldn't work with something that is.
NI remember, the more eyes on it, the better advertising it is and when people get better/more training, they are ususally more successful. Other than time/bandwidth, I don't see a reason to not make them available offline.
Thanks,
Bob Young