• Library of Congress
• classical search
• lookitup — Meta-search tool. A ton of search engines with an academic bent.
• wwwebster's dictionary — An online version of the famous Merriam-Webster dictionary.

Particularly Useful Databases (ASU users only)

• Academic Search Premier (EBSCOhost) — "(1975+) Covers a wide range of academic subjects. Features full text for selected journals, abstracts and indexing for over 3,600 scholarly journals, and coverage of The Wall Street Journal, The New York Times and The Christian Science Monitor." Search the Mass Media and Communication database as well.
• JSTOR — "Includes long runs of backfiles of scholarly journals. Subjects covered include Anthropology, Asian Studies, Ecology, Economics, Education, Finance, History, Mathematics, Philosophy, Political Science, Population Studies, and Sociology."
• Lexus/Nexus — "selectednewspapers, trade publications, legal periodicals, and scholarly journals. Includes company directories/financials"
• ProjectMUSE — "(1990+) Provides worldwide, networked, subscription access to the full text of nearly 250 quality journal titles from 40 scholarly publishers in the the fields of literature and criticism, history, the visual and performing arts, cultural studies, education, political science, gender studies, economics, and many others."