Librarians' Index to the Internet
Created by librarians, this site of over 7,500 links is your best bet for finding reliable information in the most efficient manner. It includes Best Search Tools, a collection of the best and most effective search engines on the Internet.

Infomine
Created by the University of California at Riverside. Infomine is a database of scholarly Internet resources from the Arts through Zoology.

ACRL Internet Resources
Produced by the Association of College & Research Libraries, this annotated topic guide is updated monthly.

Digital Librarian
A simple collection of the Web's best reference sites.

Google Scholar
Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research. Use Google Scholar to find articles from a wide variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web.