Ah crap,
From what I can tell (with the help of Urlsnooper2 and wireshark), it appears the json is now being hosted at
http://project.abc.net.au (on loading a gzip file identified as containing json is transferred from there) I got a 403 error trying to follow the url.
However the site itself seems to contain a lot of the directory within the source code of the channel, categories and programs A-Z pages, allowing you to branch off to each episode. Whether that would be usable for our purposes I'll leave to the coders to determine.
Hope this helps in some way.