In this post Tim Heuer is talking about String localization.
As a best practice for String resource localization, in your Silverlight application structure, organize your resource files accordingly. We’re going to use the RESX file approach and let the framework do most of the work for us. To that regard in my application I have created a folder called Resources and will be placing my RESX files there. I’ll first add the default set of data, adding a new RESX file named Strings.resx.