I, as a visual designer dislike it when a single graphic is, or becomes, synonymous with multiple types of things. The publishing of a Podcast may require the use of .xml, as a feed, but RSS is not the end all and certainly not the only feed-type possible. Therefore I move that the common orange icon for RSS feed, be replaced by a green icon, to identify the inherent differences between a Podcast, and an RSS feed.

Why green? What says "Pod" more than green. Green as a color, means wisdom and has a very populist message. Not only doesn't the publication of an Podcast require the mutilation of the wilderness and loss of trees, but it would seem an inherently wise thing to do. So I chose green, and I like it.