General Reference

Bartleby.com
Information Please Almanac
Merriam-Webster Dictionary
Old Farmer's Almanac
Roget's Thesaurus
Statistical Abstracts of the United States
Visual Thesaurus

World Countries General

The World Factbook
Background Notes
International Links
Nation Master

Biographies

Maps and Atlases

Atlapedia
Make your own Maps
Flags and Maps of the World
National Geographic
Mapquest
Satellite Maps
Zip Codes