General Resources

• YourDictionary.com
  A searchable index of online
  dictionaries, thesauri, and similar resources, including multilingual dictionaries.
• iTools
  Provides easy access to a variety
  of basic reference tools, including dictionaries, thesauri, translators, currency converters, etc.
• Encyclopedia.com
  Contains over 14,000 short articles
  from the Columbia Encyclopedia,
  6th ed.
• KnowPlay?
  Provides one-stop access to a variety of reference information services.
• World Book
  Online version of World Book Encyclopedia.
  

Art Resource

• ArtLex Visual Arts Dictionary
  Definitions for more than 3,100 terms used in visual culture, images, pronunciation notes, quotations and cross-references.
• Union List of Artists' Names
  Search for the standard names of
  artists, either individuals, or groups involved in the production of
  architecture or the visual arts of the
  type collected by museums. Citations
  of biographical sources are included
  in some entries.

Biographical Resources

• Biography.com
  A searchable dictionary related to the A&E television program Biography, brief bios of over 25,000 famous people are available. The descriptions are brief, but make a good starting place for further research.
• The Biographical Dictionary
  Biographical information regarding 27,000 notable men and women from ancient times to the present day.
• The Faces of Science
  Biographical information of African Americans in the sciences. Intended for an academic audience.

Business Resources

• Edgar
  Government database of corporate information.
• Thomas' Register of American Manufacturers
  Registration is required, but free, for searching the database. Search options include products or subject categories by keyword, or by company name. Results include company name, address, phone number, and product categories, as well as product catalogs for some companies.
• Occupational Outlook Handbook
  Searchable information on various careers, from the federal government's Bureau of Labor Statistics. The full-text of the print version.
• Salary Calculator
  Can be used to compare the cost of living in hundreds of U.S. and International cities.

  Economics

• FX Converter -- 164 Currency Converter
  Search exchange rates among 164 different currencies for any day since January 1, 1990 through the present. The currency converter is updated daily at 8:00 p.m. E.S.T.
• FRED II: Federal Reserve Economic Data
  Searchable database of historical U.S. economic and financial data, including daily U.S. interest rates, GDP, CPI, PPI, monetary & business indicators, employment, exchange rates, balance of payments, and regional economic data for some states.

Government/Political Resources

• FirstGov
  Official U.S. Government search
  engine -- searches 47 million State
  and Federal pages.
  
• Bureau of Labor Statistics Data
  The Consumer Price Index, labor force statistics, compensation and working conditions, etc.
• Thomas
  U.S. Government-maintained, searchable database of information regarding current and past federal legislation and other Congressional data.
• FedStats
  Central, searchable site of statistical data collected by various government agencies.
• InfoNation
  Searchable database of statistical data regarding United Nations member nations.

Health Resources

• The HIV InSite Knowledge Base
  Comprehensive, on-line textbook of HIV disease from the University of California-San Francisco and San Francisco General Hospital. Includes medical, social, and educational information.
• Healthfinder
  Searchable database of reliable online health publications, clearinghouses, web sites, etc. maintained by the US Government's Office of Disease Prevention and Health Promotion.

Historical Resources

• Cybrary of the Holocaust
  Contains photos, literature, and primary sources relating to the Holocaust.
• Making of America
  A searchable collection of digitized primary source materials in American History.

Maps/Geographical Resources

• Color Landform Atlas of the United States
  Organized by state -- each link brings up a list of maps and information about the chosen state.
• USGS National Mapping Information
  Searchable database of information on places within the US.
• CIA World Factbook
  Contains topical/statistical about the countries of the world. Maintained by the CIA and compiled from various governmental agencies.
• 50 States and Capitals
  Facts and background information on each of the 50 states.
• National Atlas of the United States  
  Societal, historical and scientific information in map form published by the U.S. Government.  Updates the print version from the 1960's.
  

Science Resources

• Constants and Equations Page
  Contains lists of scientific constants and equations for astronomy, science, and mathematics.
• EurekAlert!
  An electronic index of research advances in science, medicine, health and technology. Some information is password protected, and some is available only for a fee, but most is free.
• The Faces of Science
  Biographical information of African Americans in the sciences. Intended for an academic audience.

  Astronomy

• The Nine Planets
  An introduction to the solar system.

Biology

• Virology on the Web
  Covers the field of virology. Includes the "Big Book of Viruses" with color pictures and information on virus families.

• Dictionary of Cell Biology (3rd ed.)
  Intended for students needing definitions of terms in biology texts. May be searched on an occasional basis (once/90days).

  Botany

• PLANTS Database
  Contains information on approximately 45,000 currently recognized plant taxa, vascular and nonvascular within the US and its territories. Searchable by common name, as well as scientific name, family or genus. Limiting and sorting features are available. Few photos.

  Chemistry

• Periodic Table of Elements
  Interactive web site based on the periodic table. Includes information on each element
• WebElements
  Interactive web site based on the periodic table.  Includes information on each element

Writing Resources

• A Guide for Writing Research Papers
  Describes the research process, and includes examples of note cards, outlines, and examples of plagiarism in a number of forms. Also includes instruction in using MLA-style documentation.
• Guide to Grammar and Writing
  A comprehensive guide for grammar and basic writing with examples and interactive tutorials.
• Bartlett's Familiar Quotations

Miscellaneous

• Internet Movie Database
  Includes filmographies, plot summaries, character names, ratings, length, awards information and much more on more than 130,000 films.
  
• Symbols.com
  An online version of Carl Lingman's Thought Signs . The site includes alchemical glyphs, astrological signs, scientific ideograms, etc.