Maps

Acronym Finder
A searchable database containing common acronyms and abbreviations about all subjects, with a focus on computers, technology, telecommunications, and the military
Bartleby
Encyclopedia, atlas, dictionary, quotations (including Bartlett's)
Bible Gateway
Search several different versions by passage, topic, keyword.
Biographical Dictionary
This dictionary covers more than 33,000 notable men and women who have shaped our world from ancient times to the present day. It can be searched by birth years, death years, positions held, professions, literary and artistic works, achievements, and other keywords.
Dictionary.com
HowJSay.com
Pronouncing dictionary
The Free Library
Internet Encyclopedia of Philosophy
Searchable database [University of Tennessee-Martin]
Internet Public Library
Collection [University of Michigan]
iTools
Sampling of available resources: currency converter, universal translator, stock quotes, dictionaries
Library Spot
RefDesk
National Inventors Hall of Fame
Newseum
Today's newspaper front pages; archives
RefDesk
Convenient links to popular online almanacs, calculators, dictionaries, directories, encyclopedias, historic documents, quotations, statistics, and thesauri
The Reference Desk
Comprehensive collection of reference links
RhymeZone
Searchable database [Carnegie Mellon University]
Roget's Thesaurus
Searchable database [University of Chicago]
The Virtual Reference Desk
Search by keyword; browse by subject groupings.
Virtual Schoolhouse
A variety of resources [University of North Carolina]
A.Word.A.Day
World Fact Book [CIA]
Merriam-Webster Dictionary