A distributed "subject tree", Argus Clearinghouse reviews, rates, and links to the finest independent annotated specialized directories of Internet resources. Their search engine lists topical directories, not websites.

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The WWW Virtual Library is another excellent distributed subject tree, differing from Argus in that the WWWVL is entirely based at colleges and universities around the world, each one maintaining an annotated links list for a separate category.

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The Internet Public Library is an integrated "subject tree" directory, organized in "library" form. This search is limited to the IPL's Online Text Collection, which contains over 17,000 online books and research reports that can be browsed by author, by title, or by Dewey Decimal Classification.

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Originating as the "Bulletin Board for Libraries", BUBL is the premier subject tree based in the UK, and contains links to a higher percentage of UK sites than other directories. The search results list both specific websites and BUBL directory categories.
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Infomine is an academic subject directory containing over 20,000 good links for scholarly research, based at the U. of California at Riverside.

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Traffick.com
Traffick.com is a site dedicated to news and information about major web portal sites.

About.com
About.com (formerly The Mining Company) is a collection of over 700 topical subject guides to Internet resources, each maintained by an expert in the field.
DMOZ Open Directory
Similar to Yahoo, but with better site descriptions, Netscape's Open Directory Project is a directory of almost 2 million sites maintained by over 26,000 volunteer editors, and freely licensed to other sites. It is more comprehensive and less selective than the other directories listed here.

Other Portals:

Michigan eLibrary
Yahoo
Netscape
Microsoft Network (MSN)
Lycos
Excite
MyWay.com