@mark Very hard to speak in generalities, but essentially my ideal would be that the information is available in both written (i.e. article) and video form, BUT the video script has to be reasonably good enough to be treated like a podcast as well.
That said, I'm in maths academia and I can flat out say that some concepts are much better expressed in e.g. video/interactive/visual mediums than in written mediums, so figuring out an ideal would hugely depend on the content to be presented.
@matthras I agree this is a great option for many types of information. More thought and preparation required, but the end result is that the information is accessible to the widest range of people.