Having had a detailed look at the Patch News API, let us fire some code to consume it:
MD5Managedclass from http://archive.msdn.microsoft.com/SilverlightMD5, and add it your solution using the Solution Explorer's Add | Existing Item option.
Json.NETlibrary from codeplex.com at http://json.codeplex.com/; extracting it creates the Json45r7\Bin\WindowsPhone directory which contains the files we need. We will use this library to parse JSON within our example application.
Json.NETlibrary to your solution as a reference by browsing to the directory where you have downloaded the library; ...