The Yahoo! subject directory is one of the oldest and most recognized web subject directories. Although Yahoo! has recently emphasized their search engine and other services, the Yahoo! directory is still a great place to find high quality web sites.

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This comprehensive subject directory is compiled by a coalition of librarians at the San Francisco Public Library.

This subject directory is maintained by the Drexel University College of Information Science and Technology and a consortium of other information science schools.

The Open Directory Project (also known as DMOZ) is unique because it is a directory created by a volunteer editorial staff. You, too, can volunteer to be an editor in your area of expertise. Read the Open Directory Project blog for more information about this resource.