Subject Catalogs (to browse by category)

Yahoo	Perhaps the best subject catalog
Infomine	"Scholarly Internet Resource Collections"
Britannica	Ranked and Annotated Sites
Best Information on the Net	Annotated links for students and teachers
Librarians' Index to the Internet	Excellent collection of annotated links
Digital Librarian	Librarian's choice of the best sites on the web
WWW Virtual Library	Useful list of general sites
Awesome Library	12,000 reviewed education resources, with a directory, an index, and a search engine