I think the way podcasts work, is that you have an RSS feed and it updates when new MP3's are uploaded. I've never setup an RSS feed, but I think it's just some server side scripts that update an XML file which points to the most recent MP3 file, and each file is given a name with an appropriate stamp to keep them all in order. When you run iTunes or whatever RSS feed reader/podcast receiver, it just downloads the XML, checks for changes, and downloads the new audio file. Correct me if I'm wrong though.
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