once the Easy Podcasting Plugin is installed and you configure it, you find a description at the top of the page.
The http:// is doubled.To get RSS feeds of only specific filetypes, you can access/advertise a feed with a URL like http://http://deimhart.net//rss.php?version=2.0&podcast_format=ogg.
In my opinion it is a good idea to add a link to the iTunes specification in the description area.
Cheers
Dirk