Although the introductory information on this page identifies it as a place for Science online resources, it also has links to resources for other disciplines as well.

This is a directory put together by librarians. . .  Be sure to go to the bottom of the page and click on “What does this page look like through a Librarian’s eyes?”  It’s not just for students; like many of the others listed here, it includes lesson plans.

Search for library home pages by library name, location, or type; includes academic, public, special, school, state, regional libraries, and library organizations.

Libraries Online is a virtual library resource center for educators and students, librarians and their patrons, families, businesses and anyone exploring the Web for valuable research information

This is not just for Librarians!  Like Yahoo, this is a directory, but it’s a non-commercial one.  The sites listed here were selected by librarians, and are recommended for students’ use.