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This post has been migrated, original date 11 Aug 2008 I though I would quickly document an assembly attribute that I find incredibly useful. It the InternalVisibleTo attribute: 
[assembly: System.Runtime.CompilerServices.InternalsVisibleTo("assembly name")]
For more info see http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.internalsvisibletoattribute.aspx