the good news: many learning institutions know this, and are starting to use podcasting or it's younger brother "audio-based learning" to extend their reach (albeit slowly).
This blog-post is dedicated to some of the really nice sites that help you know what you need to do to get started:
- Andy Ramsden's summary on handheld learning and his good practice guide
- Kim's article at futurelab
- Jason's guide to doing your own (as well as some great articles about podcasting)
- Some thoughts from wisconsin about audio lectures
ps: I see more and more schools are starting to invest in mobile resources: in this case ipods!