BlogPulse is an automated trend discovery system or a blog search engine from Nielsen BuzzMetrics. BlogPulse applies machine-learning and natural-language processing techniques to discover trends, analyzes and reports on daily activity in the blogosphere.

BlogPulse.com features the following:

• Search Engine for blogs
• set of Buzz-tracking tools and featured trends tools: to track blog activity on key issues, people, news stories, news sources, bloggers and more
• daily blog stats (number of blogs identified, new blogs created, number of blog posts analyzed)
• Trend Search: allows creating up to three specific topics trend charts comparing buzz in the blogosphere
• conversation tracker: follows the discussion, or conversation from individual blogs or posts
• Blogger Profiles that identify top-ranked blogs

More info: BlogPulse