See also (in this book): RSS syndication

Blogs are indexed on general search engines such as google, but there are also many blog-specific directories and search services.

• Technorati lets you enter a blog's address and see a ranked list of other blogs linking to it - this is called the blog's 'technorati cosmos'.
• Technorati also now has a keyword search option, which let's you search for blogs containing any keyword or phrase.
• Blogdigger is a blog search engine