Resharper 4.5

in future ReSharper 4.5 version we are going to mark publically unused methods and types with Solution Wide Analysis. – Ilya Ryzhenkov

This will not help if the solution is being split into the multiple sub-solutions (i.e. common libraries that are referenced by other solutions), but for the internal types - it is simply wonderful.

And we still have NDepend for the complex scenarios.