About.com (popular/commercial) evaluated subject guides
AlphaSearch allows the user to search or browse full-text documents, databases and gateways organized by disciplines.
Argus Clearinghouse - evaluated subject guide (librarian/academic)
BUBL LINK- organized by Dewey number (European focus) Infomine is a high-quality, scholarly sites selected by librarians, suggests related terms to search. Good for academic topics.
GO is a "tree" with sites reviewed by editors, updatable by Infoseek Web Search. Good for popular topics.
Librarians' Index to the Internet is "a thinking person's Yahoo". Good for academic topics.
New Athenaeum "guide of guides" all languages (estimates reading level)
WWW Virtual Library - search or browse full-text documents, databases and gateways organized by disciplines.
Yahoo is a "tree" with sites submitted by users. Good for popular topics.