Databases
Books / English / Language / Literature
Google Books - Mashup with Google Maps that plots places in books.
English: public domain texts
Translate- translate books, documents, websites
Scholar -earch engine that indexes the full text of scholarly literature
Social Studies / History / Education / Sociology
GapMinder - Worlds statistics, country comparisons
Nationmaster - Worlds statistics, country comparisons
StateMaster - research and compare a multitude of different data on US states.
U.S. Census - Compare communities, states, etc.
Social Explorer - Mapping of US demographic data
Almanacs - Facts and figures on countries, etc.
National Atlas - Maps of a wide variety of national characteristics
Schools Databases - Data on Southern California
Sicence / Mathematics
Wolframalpha - Computational knowledge engine
GapMinder - Worlds statistics, country comparisons
Nutritional Analysis Tool - Compare your diet for RDA
ArcGIS online - Mapping
Chapter 19 - Scientific Databases
Business, Economics, Finance
Google Finance - Interactive stock charts, business history mashups
PropertyShark - Information on communities: population, hazards, income, taxes, demographics, etc.
Health & Physical Education
Nutritional Analysis Tool - Compare your diet for RDA
MyPyramidTracker - dietary and physical activity assessment tool
AskTheDietician - healthy body calculator
Activity Calorie Counter - calculate the number of calories you burn for many activities
Databasesports - Extensive database on professional sports teams
Music, Art
Itunes - Apple's music database
Pandora - create your own Internet "radio station". Analyze music with music genome project
Web Gallery of Art - Art Database