I am a podcast geek and the further my OU studied take me the more I a convinced this technology is both under rated and under utilized (though I must confess to having done a sneaky search to check that it was them, and not I, who had under utilized the podcast!)
The OU does produce a number of podcasts around disciplines as wide ranging as learning Italian (amongst many other languages), creative writing, astronomy and project management. I cannot describe how helpful I would have found additional instruction about the theories of education or a glossary of key terms at the start of my studies. Whilst there are resources I could have found and read, having something to listen to on my commute, or at the gym, would have made use of some time in which I couldn't read or watch.
That is, I think, the strength of the podcast - it uses a spare sense (hearing) in times and spaces where other resources aren't useful. There is something quite special about hearing experts explain their expertise. I often understand things I have heard explained better than things I have read.
Outside of my OU studies I listen to dozens of podcasts - some for entertainment but many for learning as well. The learning is pretty non-linear and scattergun as I can only listen to material which has been produced. An institution like the OU would be in a position to create short (or long) series on the fundamentals of hundreds of subject matters. This would not only be useful for people studying those subjects but may simply be interesting for those who love to learn outside of formal structures.
Podcasts are free and easy to access. They make use of the one commodity we all have in equal measure and which cannot be bought or sold - namely time. I hope, in time, a podcast version of YouTube with the vast choice of professional and amateur content, every subject under the sun and ease of access and sharing will develop.