http://www.allexperts.com
Ask any question. AllExperts.com is the oldest & largest free Q & A service on the Internet.
Britannica.com
http://www.britannica.com
Includes the complete, updated Encyclopedia Britannica, the oldest and largest general reference in the English language. Selected articles from more than 70 of the world's top magazines - including Newsweek, Discover, and The Economist.
http://www.pbs.org
PBS OnLine can delve further into the subjects you most enjoy - from news to history and the arts to science and technology. Merges online and television media.
refdesk.com
http://www.refdesk.com
"The single best source for facts on the Net" Has made many top 10 lists, top news, online newspapers, weather, dictionaries, encyclopedias, and a wealth of other reference resources.
Research-IT!
http://www.itools.com
Language, Library, Geographical, Financial, Shipping, and Internet Tools.
S9.com "The Biographical Dictionary"
http://www.s9.com
This dictionary covers more than 28,000 notable men and women who have shaped our world from ancient times to present day.
http://www.lcweb.loc.gov
The Library's mission is to make its resources available and useful to the Congress and the American people.
The WWW Virtual Library
http://vlib.org
Possibly the biggest library on earth. Easy search, any subject.
Today in History
http://www.history.com
Archive Films/Photos has over 40,000 hours of archival stock footage and 20 million photographs, engravings, and drawings spanning over 3,000 years of world history.
xrefer "The Web's Reference Engine"
http://www.xrefer.com
Encyclopedias, dictionaries, thesauri, and books of quotations from the world's leading publishers. All cross-referenced, all reliable, all in one place.