Patterns & Practices has released Hilo guidance: Developing a Windows Store app using C++ and XAML which is part of the Windows SDK.
(This content was written based on Silverlight for Windows Phone, but might be valid for generic Silverlight.)
There are a many articles on MSDN (and all over the Internet) about globalization and localization of Silverlight applications in general and specifically Windows Phone 7 applications but I haven’t found any that uses a value converter.
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