We have just posted audio versions of my Oracle OpenWorld Live "TechCast" chats with Kris Rice (Database Tools), Mike Lehmann (Oracle WebLogic architecture), Bill Dettelback (WebLogic Server for PaaS), and Kuassi Mensah and Chris Jones (the Dynamic Languages Duo). The audio of my chat with James Gosling has been available for a while.
Of course, if you are a TechCast subscriber via iTunes, you will download these mp3s automatically.
As I have written previously, we are working on a complete TechCast overhaul, which may entail, among other things, live broadcasts. When I know, you'll know.