Podcasting provides various ways to distribute audio or video programs over the Internet using a publisher/subscriber model. It's best used in a situation where you want users to elect to receive an ongoing series of published audio or video files.
If you are more interested in simply posting audio/video files to the Web or streaming audio/video for these reasons, please check DukeStream to see if it provides resources to better fill your need.
For an entertaining and informative introduction to podcasting go here.
Duke is participating in Apple's pilot program, iTunes U.
This program allows courses and academic units to place audio and video content into a special segment of the iTunes music store for easy retrieval and attractive display. If you are interested in taking part in this extended pilot, please visit the iTunes U administrator page and follow the "getting started" steps. You can view the Duke iTunes U site at itunes.duke.edu . Entering iTunes U requires that you have iTunes installed.
OIT maintains a self-serve soundbooth at the American Tobacco Campus
Please see http://www.oit.duke.edu/soundbooth/ for details.