GIT Resources - Data Sources
NYS GIS Clearinghouse
http://www.nysgis.state.ny.us/
CUGIR – Cornell University Geospatial Repository
http://cugir.mannlib.cornell.edu/
NYS Museum GIS Data
http://www.nysm.nysed.gov/gis/
Census 2000 TIGER/Line Data
http://arcdata.esri.com/data/tiger2000/tiger_download.cfm
USDA: NRCS: Geospatial Data Gateway
http://datagateway.nrcs.usda.gov/
GeoData links to several websites that contain GIS data.
http://gos2.geodata.gov/wps/portal/gos
Cartographic Boundary Shapefiles from the US Census Bureau.
http://www.census.gov/geo/www/cob/index.html
National Atlas
http://www.nationalatlas.gov/atlasftp.html?openChapters=#chpagri
Library of Congress Map Collections
1500-1999 from which you can search for existing maps that could be georeferenced in ArcMap.
http://memory.loc.gov/ammem/gmdhtml/gmdhome.html
Google SketchUp 3D Warehouse from which you can download and share 3D models for SketchUp.
http://sketchup.google.com/3dwarehouse/