Tailrank

http://http://tailrank.com/
Tracking the Hottest News in the Blogosphere Tailrank is a memetracker which finds the hottest posts from thousands of blogs so you don’t have to. Tailrank find the hottest stories by tracking conversations between bloogs. Tailrank takes into consideration linking behavior, the text of the post, links in common with other users, search relevance, and various other factors for recommendations.