Micro Persuasion:"
Track When a Blogger Discusses a Particular Subject.
Let's say you read a blog like Boing Boing that covers a diversity of topics, but you only really care when they talk about Google. You can use Technorati to set up a feed to bring you only these posts. First, find Boing Boing in the blog directory. Next enter a term in the search box. The search will turn up this page of results. There will be a link to the feed on the right side of the page."
