You can post enhanced podcasts such as this one, in the Apple iTunes store for easy download accesability. I have used this particular one for our "New to Moodle" moderators that need to post resources to their section.
Other applications of this might be....
students being able to download next weeks lecture
specific lab demonstrations/procedures so that students can review at own pace
directions for step by step processess that need to be taught
(Note this opens in iTunes - you could do the same sort of thing with Vodcast files in .mp4 and have it open in a framed window in Moodle.)
This is the actual xml link:
This also works with Vodcast