Some Free Blog Monitoring Tools
1. Technorati- Works as a search engine for blogs, indexing hundreds of millions of blogs that are rated on content, author authority, and popularity. http://technorati.com/
2. Blog Pulse- A tool that analyzes and reports on daily trends within the blogosphere based on a specific search term. http://blogpulse.com/
3. Google Blog Search- It's like a normal Google search, but just for blogs! http://blogsearch.google.com/