http://wms-sites.com/catalog

NYC:
http://wms-sites.com/catalog/NYC-Free-Map/
http://nyc.freemap.in/cgi-bin/mapserv?map=%2Fwww%2Ffreemap.in%2Fnyc%2Fmap%2Fbasemap.map&SERVICE=WMS&REQUEST=GetCapabilities

Demis:
http://wms-sites.com/catalog/World-Map/
http://www2.demis.nl/wms/wms.asp?wms=WorldMap&REQUEST=GetCapabilities&SERVICE=WMS


Canada, ArcIMS:
http://www.geographynetwork.ca/wmsconnector/com.esri.wms.Esrimap/OBM_Full_I?REQUEST=GetCapabilities&SERVICE=WMS

De Nieuwe Kaart van Nederland:
http://wms-sites.com/catalog/de-Nieuwe-Kaart-van-Nederland/
http://webservice.nieuwekaart.nl/cgi-bin/nkn?REQUEST=GetCapabilities&SERVICE=WMS

TerraServer (US):
http://terraservice.net/ogccapabilities.ashx?REQUEST=GetCapabilities&SERVICE=WMS