Tagsy
(It’s not ready yet, but you can opt in to be notified about our developments. )
tagsy is a social bookmarks and feed management service, allowing you to save, categorize and browse information based on its popularity and relevance. It was born out of our frustration with fragmentation of content between various blog feeds, feed aggregators, social bookmark managers and other content aggregating services.
UPDATE 9/6/2006:
Tagsy seems dead. (changed the status)
☍ 01.10.2005