In very very very beta, RSSor is a del.icio.us clone (seriously, look at it!) for feeds. The concept is interesting. Tag a feed and a unique page is created for the content for the feed (ie, the the "page" for Library Stuff content) You can then add blog posts to del.icio.us or Furl (I love that!), comment on each post post (which didn't seem to be working this morning [lots of other 404's on the site as well]).
One of the slickest aspects of RSSor is that the main site or your feed tags is an aggregator. Very neat and useful. I wonder how often the feeds update.
Again, this tool is in very early beta and needs to work out a bunch of kinks, but there are a few interesting pieces to it. Another similar to look at is Feed Maerker which has been in development for about a year. (link via Oishii)
Read more about it here