BlogPulse is a window into the blogosphere, a way to discover the people, issues, blogs, posts, commentaries, tidbits and news that bloggers are discussing. Use the trend search to create graphs that plot “buzz” about specific search terms (issues, people, companies, brands, sports, etc.)  Use the profiles tool to track your favorite blogger and learn more about posting behavior, linking activity and how influential they are.  Blogpulse offers valuable insight into any topic, author, and the ways readers are interacting with both.

Cost: FREE

contact page: http://www.blogpulse.com/contact.html