In reply to Chris Aldrich.

High on my wish list for readers is to be able to tag feeds, not (just) categorise them into folders. This as I follow people not 'media', and people have multiple facets. They never blog solely about e.g. tech or cat pics. The feeds I follow represent people, so I put them in folders roughly equivalent to the social distance between them and me (from significant other to total stranger basically). Tags on feeds (not articles, which various readers allow), make it possible to do things like "what are the German coders I know talking about this week", so things based on interests, geography, and communities.