E-REFERENCE

refdesk.com - One-stop reference

Merriam-Webster Dictionary & Thesaurus
Roget's Thesaurus

Bartelby.com: Full-text Reference (including the 1901 edition of Bartlett's Familiar Quotations), Literature, and Verse

FedStats - gateway to statistics from over 100 U.S. Federal agencies

Information Please -encyclopedia and almanac.

National Library of Medicine Links to MEDLINE consumer health info in both English & Spanish, Household Products Database and Genetics Home Reference.

Occupational Outlook Handbook

INFO ABOUT SPECIFIC COUNTRIES

• Country Reports
• CIA World Fact Book - a good place for country profiles.
• Background Notes - US Dept. of State. Facts about the land, people, history, government, political conditions, economy, and foreign relations of individual countries. 
• Library of Congress Country Studies (full-text electronic books)
• Official government Web pages, organized by country

PRIMARY SOURCES

• The Sudbury Archives - The local history database includes approximately 15,000 records dating from 1639 to 1850.
• Thoreau Institute at Walden Woods Library
• 100 Milestone U.S. Historical Documents 1776-1965 - National Archives & Records Administration
• Library of Congress: American Memory Project - Good source of American History primary sources

TIMELINES

• Hyper History Online -3000 years of world history with graphics, lifelines, timelines and maps.
• History Channel timelines