A couple of free public domain USGS overlays you might find useful:

http://mcmcwebmap.usgs.gov/OGCConnector/servlet/OGCConnector?request=GetMap&ServiceName=national_atlas_data&layers=County+Boundaries&srs=EPSG:4326&format=image/gif&transparent=true&version=1.1.1&styles=&width=1200&height=800&bbox=-125,25,-65,55

http://ims.cr.usgs.gov/wmsconnector/com.esri.wms.Esrimap/USGS_EDC_National_Atlas?request=GetMap&layers=ATLAS_COUNTIES_2001&srs=EPSG:4326&format=image/gif&transparent=true&version=1.1.1&styles=&width=1200&height=800&bbox=-125,25,-65,55

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