Web Directories?

Web directories are not search engines in the typical sense; they are collections of links
that have been organized by humans. The advantage of web directories over typical
search engines is that all the links are (usually) reviewed by human editors for quality,
relevance, and suitability before being posted online. Make no mistake: some web directories
are completely automated. You should avoid these types of directories.
The most famous web directory, Open Directory Project, boasts 4,576,062 URLs in its
listings at the time of this writing. Most web directories, including Dmoz.org, can also
be searched.
Not all web directories are free. Some require yearly or one-time listing fees. One such
directory is Yahoo!.