An email on one of our internal aliases made me realise that I hadn't included the namespaces I'd included in the code for accessing for these entries. Someone referenced my blog entry and gave me credit for writing my own JavaScript serialiser - fortunately the Silverlight team put one in there for me which I suspect is slightly more robust than the one I would have knocked up. Anyway, here are the using statements you need (for C#):

using System;
using System.Windows.Browser;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Browser.Net;
using System.IO;
using System.Windows.Browser.Serialization;
using System.Net;

This refers to Accessing ASP.NET Application Services from Silverlight part one, part two and part three.

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