Now that I am free of studying for any exams, I am getting back to C++ and looking into Shell programming (for DownStream).  Does anyone have any suggestions on resources to help me with writing a Shell Extension (besides the platform sdk)?  C# or C++ doesn't matter to me.

So far I have found these:

From MSDN: Create Namespace Extensions for Windows Explorer with the .NET Framework
From CodeProject: Michell Dunn's The Complete Idiot's Guide to Writing Shell Extensions

Anyone have some favorite resources for writing shell extensions?