Application data no windows phone

http://msdn.microsoft.com/en-us/library/windows/apps/hh700361.aspx

Converter um Json em classes C#

http://json2csharp.com/#

Artigo muito bom:
http://www.c-sharpcorner.com/Blogs/12853/json-parsing-in-windows-phone-using-datacontractjsonseriali.aspx

Download de arquivos Json e Parse no Windows Phone C#

http://stackoverflow.com/questions/12669951/how-to-download-json-in-windows-phone

http://www.codeproject.com/Articles/546430/Parse-JSON-to-Csharp-in-WinRT-Silverlight-WPF-Wind