Technorati: A Search Engine for Blogs

Technorati.com is a search engine that tracks the vast world of weblogs or blogs (currently over 82 million) "and the other forms of independent, user-generated content (photos, videos, voting, etc.) increasingly referred to as 'citizen media.'" It's a wonderfully focused search tool that retrieves material from specific types of sites, i.e. blogs, much more effectively and efficiently than more general search engines like Google and Yahoo!.