Andrea Boschin has created a T4 template that it is able to read a resx file and automatically produces the proxy class.
Source: Silverlight Playground
If you evere tryied to localize a Silverlight application, you have found for sure that it is not a straighforward task. Like all the other .NET tecnologies the Silverlight projects has resource files and you can create satellite assemblies to contains culture specific strings. But the problem is that it is not so easy to bring this string to the interface.