WebService or any RSS Feed which return latitude and longitude of the city

Could anybody tell me about webservice or any RSS feed which wil return Latitude and Longitude corresponding to the city name given?? I had tried www.webservicex.net but couldn't get.I want get XML, which 开发者_运维百科I can parse further to get Latitude and Longitude...

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Google Maps?

They have several ways to access their API: http://code.google.com/apis/maps/index.html