Metadata for Podcasts

Dave Winer and Marc Canter are talking about metadata for podcasts. I'd like to turn the discussion on its head and look at how to including the podcast metadata into the standard Dublin Core HTML metadata. Work done for GEM (Gateway to Educational Materials) is probably useful because they deal with duration. This is espcially important for podcast because why they now audio, there is no reason why many other file types won't be in future podcasts. My work involves reading an HTML page and its metadata to make an RSS item.