An informative article by librarian Christina K. Pikas:
Blogs are everywhere, and it is important to either be able to search them or to make sure you?re not searching them when you are looking for authoritative, accurate, and unbiased information. As blogs and RSS feeds either continue to explode across the net or start to go out of style, the search engines will adapt. Next time you are shopping for a new technology product try searching in a blog search engine to see what people are saying. Use Waypath to find related blogs. If you need to do a very precise search, use Feedster; but, if you want a little of everything, stay with the big general search engines (like the one that starts with G).