Yahoo! http://www.yahoo.com

Yahoo! an acronym for Y et A nother H ierarchical O fficious O racle was one of the first and most popular subject indexes. Yahoo's subject index is divided into 14 main categories. Each of these categories is further divided into subcategories.   As the information grows, so do the categories. Paid Yahoo editors search out appropriate information, categorize it and publish it for general use. In Yahoo's directories, the "@" sign next to a category indicates a cross reference.

The Librarians' Index to the Internet http://www.lii.org

This site, subtitled Information You Can Trust, is a program of the State Library of California. The Librarians' Index to the Internet (lii.org) is a searchable, annotated subject directory of more than 11,000 Internet resources selected and evaluated by librarians. Every site entered in the lii.org database is reviewed at least twice--sometimes three or four times--before it goes "live."

The Open Directory Project http://www.dmoz.org

Also known as the ODP or DMOZ, this site is the premier open subject index on the net.   The Open Directory Project claims to be ".the largest human-edited directory on the web."   Major search engines like Google, Teoma, HotBot, and Lycos, contract with the Open Directory Project to provide directory services.

About.com http://www.about.com

This site employs expert guides to develop and moderate information and interaction in 23 'channels'. The About network claims to have human edited information on more than ". 50,000 subjects with over 1 million links to the best resources on the Net and the fastest-growing archive of high quality original content."   One draw back to the About Network is the number of commercial services and their aggressive add placement policies.

INFOMINE: Scholarly Internet Resource Collections http://infomine.ucr.edu

INFOMINE is a virtual library of Internet resources relevant to faculty, students, and research staff at the university level. It contains useful Internet resources such as databases, electronic journals, electronic books, bulletin boards, mailing lists, online library card catalogs, articles, directories of researchers, and many other types of information. INFOMINE is librarian built. Librarians from The University of California, Wake Forest University, California State University, The University of Detroit - Mercy, and other universities and colleges have contributed to building INFOMINE.