Well I originally meant in the list menu. However, after resetting my feed to stock I noticed you do have icons but the sites I have are not working for Linguine for some reason.

Exactly, well I was thinking about an "unread" list menu item.

Also you can't really tell the source of the feed from the list anyway (without icons), obviously the contents would give you a clue.
I would think in a list you want to know were the feed is from, OTOH if all feeds are mashed together you would be happy with an icon.
Maybe looking at other feed readers would better make sense of what I mean re grouping.
Lifera is a good example
http://lzone.de/liferea/screenshots.htm

I am imagining "All", "Unread", "Important" followed by topic groups because really does it matter if it's a podcast, text or images? Wouldn't it be more useful to have "Sport", "World News", "Computing" for example.
Or maybe I am trying to make Linguine into something it's not?...Sorry went off on a tangent there...
Well I have used HTML, XML and RSS before for websites I have setup so I am just guessing the tags really.
Some of my feeds are throwing errors but the MotoGP one worked.

BTW this is a good comic strip feed to add to your list. Unfortunately you don't have a image feed type to display it
http://xkcd.com/atom.xml