National Data Clearinghouses
Federal Geographic Data Committee
The National Map Viewer (USGS) - Orthophoto, elevation, digital raster graphic, and many more
Earth Explorer - Several types of data
GIS Data Depot - U.S. and some international geospatial data (Requires login)
Starting the Hunt - By U.S. state. Includes links to attribute data as well as geospatial data
National Historical GIS - Historical U.S. Census data (1790-2000)
Census 2000 TIGER/Line Data - From ESRI
Census Bureau Maps - U.S. Census Bureau. Includes up-to-date boundary files
Chronic Disease GIS Exchange -CDC, useful for public health data and maps. Also contains some tutorials and software.
CloudMade - Detailed political boundary maps of countries and many more.
Historical GIS clearing house - List of many external, international GIS data sources.
Free spatial data from DIVA-GIS
LandScan by Oak Ridge National Lab - Global population distribution data
Stanford University: Websites for Digital GIS data - Links to many useful GIS data sites
How to find coordinates on Google Maps 1 - Short Java script method
How to find coordinates on Google Maps 2 - Google Maps Add-on
GIS Job Clearinghouse
NYS GIS Association
Free online statistics software
Originally developed for GEOG245: Geographic Information Systems, Department of Geography, Colgate University, Hamilton, New York