This article on the OEDB site,Research Beyond Google: 119 Authoritative, Invisible, and Comprehensive Resources, lists 119 useful Web sites. I thought that this might be worth passing along to share. The article organizes the sites into the following categories:
Deep Web Search Engines
Art
Books Online
Business
Consumer
Economic and Job Data
Finance and Investing
General Research
Government Data
International
Law and Politics
Library of Congress
Medical and Health
Science
Transportation