If you're like me, you've got an FoF subscribe
bookmarklet and you're often finding interesting stuff
and pushing it so the feed will appear in your FoF.
Over time, the list gets to be long (I mean long).
(Your addition of categories is great for managing
these long lists btw.)
Useful would be a view of the feeds ordered by
popularity (as defined by the number of times I have
opened the feed to read it) This way, I could find the
feeds that I once thought were interesting, but are no
longer worth subscribing to, and delete them. (They'd
be at the bottom)
