GeoPlugin.net has a city-level, free version of this that's actually intended for public use: http://www.geoplugin.net/json.gp http://www.geoplugin.net/json.gp

GeoPlugin.net has a city-level, free version of this that's actually intended for public use: http://www.geoplugin.net/json.gp http://www.geoplugin.net/json.gp Other formats here: http://www.geoplugin.com/webservices http://www.geoplugin.com/webservices Have been using it in production now for several months, works great.