Request to RSS providers, PLEASE use short feed URLS! If I have a PocketPC or Smartphone with an RSS Reader on it, I'd like to add your feed quickly! :). Having long names makes it a disincentive for mobile device users to read your pages.
Example (sorry BBC): http://news.bbc.co.uk/rss/newsonline_world_edition/technology/rss091.xml
How about shortening that to:
I think that is sufficient to capture the hierarchy presented in the original URL.