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Generating a Version Independent ProgID in a C# Component that is being exposed as COM is apparently tantamount to Voodoo.  Nothing has been written about it either in Google Groups or in Google proper.  Sam Gentile in his wisdom confirmed to me that there is no [VersionIndependentProgID] attribute or the like. 

So, sounds like I'll need it manually in my own "DllRegisterServer" functions:

[ComRegisterFunctionAttribute]
public static void myDllRegisterServer(string registrationLogic) {
   // perform my logic 
   Trace.WriteLine( "Registration is occuring ..." );

}

[ComUnregisterFunctionAttribute]
public static void myDllUnregisterServer(string registrationLogic) {
    // perform my logic
    Trace.WriteLine( "Dis-Un-registration is occuring ..." );
}