Public Sources for Satellite and Aerial Photos and Maps
All States USGS National Map Viewer Hi-Res Orthography USGS DOQ BW Index USGS DOQ Color Index	http://nmviewogc.cr.usgs.gov/viewer.htm
All States USGS Seamless Hi-Res Orthography of Selected Cities	http://seamless.usgs.gov
All States USGS Orthoimagery	http://edc.usgs.gov/products/aerial.html
All States Terraserver-USA Photos and Topographic Maps	http://www.terraserver-usa.com
All States MapQuest	http://www.mapquest.com
All States and World Google Maps Orthoimagery	http://www.maps.google.com
All States and World NGA-Earth	http://www.nga-earth.org/
Selected All States Bing Birdseyes and Orthoimagery	http://www.bing.com/maps/
All States National Spatial Data Infrastructure	http://www.geo-one-stop.gov/
All States FEMA Disaster Maps and Remote Sensing	http://www.gismaps.fema.gov/gis02.shtm
All States US Agriculture Department Historical Aerial Photos	http://www.historicaerials.com
World Perry-Casteñada Map Collection University of Texas Maps and Satellite Photos	http://www.lib.utexas.edu/maps/
World NASA Worldwind	http://worldwind.arc.nasa.gov/
Land Use Database Center for Land Use Interpretation Transportation, Water, Cultural, Industrial, Mining, Waste, Military, Nuclear / Radioactive, R&D	http://ludb.clui.org/
US States
Several of the state GIS sites provide links to other state GISs.
Alabama Geography and Cartography Links	http://www.gsa.state.al.us/ http://www.legislature.state.al.us/misc/guide/student_teacher/reference/ref_geo_cart.html
Alaska	http://alaska.usgs.gov/science/geography/orthoimagery/index.html http://sv.gina.alaska.edu/
Arizona 1 meter DOQQs	http://aria.arizona.edu/search/jsp/doqqmapsearch.jsp
Arkansas	http://www.geostor.arkansas.gov/Portal/index.jsp
California CaSIL Map Interface DRGs DOQQs HiRes DOQQs CalView Landsat	http://casil.ucdavis.edu/mapsurfer/
California Coast	http://www.californiacoastline.org
Colorado	http://dola.colorado.gov/demog/GIS/
Connecticut	http://magic.lib.uconn.edu/cgi-bin/MAGIC_DBsearch2.pl?Geography=37811&Loc=0001
Delaware	http://datamil.delaware.gov/?c=MAPPING
District of Columbia	http://dcgis.dc.gov/dcgis/site/default.asp
Florida Digital Orthoquads 2004, 1999, 1995	http://data.labins.org/2003/MappingData/DOQQ/doqq.cfm
Georgia	http://gis.state.ga.us/Clearinghouse/clearinghouse.shtml
Augusta, GA (Requires IE)	http://www.augustaga.gov/departments/gis/home.asp
Hawaii	http://hawaii.gov/dbedt/gis/
Honolulu	http://gis.hicentral.com/
Idaho	http://gis.idl.state.id.us/GIS_Home.htm
Illinois Geospatial Data Clearinghouse 1998/1999 Digital Orthophoto Quadrangle Data DOQ files for Illinois in MrSID Format	http://www.isgs.uiuc.edu/nsdihome/webdocs/doqs/launchims.html
Indiana Aerial Photos 1998-2007 and more.	http://129.79.145.7/arcims/statewide_mxd/viewer.htm
Iowa	http://ortho.gis.iastate.edu/
Kansas	http://gisdasc.kgs.ukans.edu/dasc.html
Kentucky	http://technology.ky.gov/gis/gisdata.htm
Louisiana 2004 Digital Orthophoto Quarter Quads	http://atlas.lsu.edu/doqq2004/
Maine .5, 1, 2 ft Color and 1 meter Aerial Photography	http://megisims.state.me.us/website/orthomap/viewer.htm
Maryland 1 GeoSpatial Data Center Digital Orthophoto Quarter Quads (DOQs) - Color-Infrared Digital Orthophoto Quarter Quads (DOQs) - Panchromatic	http://www.dnr.state.md.us/gis/
Maryland 2	http://www.marylandgis.net/searchmenu.jsp
Massachusetts .5 meter Color Orthophotography	http://maps.massgis.state.ma.us/MassGISColorOrthos/viewer.htm
Michigan 1998 Digital Orthophoto Quads	http://www.mcgi.state.mi.us/mgdl/?rel=thext&action=thmname&cid=17&cat= Digital+Orthophoto+Quads+%2D+1998+series
Minnesota	http://geoserver.state.mn.us/raster2/viewer.htm
Mississippi List of Hundreds of Maps	http://www.maris.state.ms.us/ http://www.state.ms.us/frameset.jsp?URL=http%3A%2F%2Fwww.GIScouncil.ms.gov
Missouri	http://msdisweb.missouri.edu/datasearch/ThemeList.jsp
Montana	http://sun1.giac.montana.edu/mlggc.html
Nebraska	http://www.calmit.unl.edu/gis
Nevada	http://keck.library.unr.edu/data/doqs/doqs_download.html
New Hamsphire 2003 NAIP	http://www.granit.sr.unh.edu/cgi-bin/load_file?PATH=/data/database/index.html
New Jersey	http://www.state.nj.us/dep/gis/home.html
New Mexico	http://rgis.unm.edu/
New York 1 1, 2 ft Orthoimagery, More (IE 6.0 required)	http://www1.nysgis.state.ny.us/MainMap.cfm
New York 2 2000-2004 Direct Download Orthoimagery, 1, 2 ft resolution	http://www.nysgis.state.ny.us/gateway/mg/nysdop_download.cfm
New York 3 Sensitive Data/Imagery Unavailable	http://www.nysgis.state.ny.us/sensitive_unavailable.htm
North Carolina Fall 2003 NC 2ft Orthography Urban Area Mosaic	http://gisdata.usgs.net/website/NC_OneMap/viewer.asp
North Dakota	http://www.nd.gov/gis/
Ohio 2004 and 2005 1ft and 2ft Orthoimagery	http://metadataexplorer.gis.state.oh.us/metadataexplorer/explorer.jsp
Oklahoma	http://www2.ocgi.okstate.edu/2003img1/#MAP
Oregon	http://www.oregon.gov/DAS/IRMD/GEO/index.shtml
Pennsylvania	http://www.pasda.psu.edu/explore/#
Rhode Island 1997 Ortho Imagery	http://ortho.edc.uri.edu/
South Carolina	http://www.scmapping.net/
South Dakota	http://www.state.sd.us/gis/InteractiveMaps.asp
Tennessee	http://gis.state.tn.us/
Texas	http://www.tnris.org/datadownload/download.jsp
Utah	http://agrc.utah.gov/agrc_sgid/sgidintro.html
Vermont	http://maps.vcgi.org/indicators/mapping/presentation/index.html
Virginia	http://gis.vedp.org/data_resources.aspx
Washington 1996 Digital ortho quads and quarter-quads	http://gis.ess.washington.edu/data/raster/doqs/index.html
West Virginia	http://wvgis.wvu.edu/data/data.php
Wisconsin	http://dnr.wi.gov/maps/gis/datadrg.html#data
Wyoming 2002 CIR Digital Orthophoto Quads (DOQ's) and Quarter Quads (DOQQ's)	http://wgiac.state.wy.us/html/aboutDoqq2002.asp
Australia	http://www.ga.gov.au/bridge/products.jsp
Canada
Quebec	http://www.quebecgeographique.gouv.qc.ca/produits.asp
Italy Italian satellite GIS ortho, BW and Color. (note, IE only and a plugin to install)	http://www.atlanteitaliano.it http://www.pcn.minambiente.it/pcn/ACCESSI/accesso.asp
United Kingdom
Ordnance Survey	http://www.ordnancesurvey.co.uk/
MultiMap	http://www.multimap.com/
Getmapping (includes New York City and Sweden)	http://www.getmapping.com/