JetBrains, the creators of the IntelliJ IDEA Java development tool, have an early release version of a Visual Studio .NET add-in for C# called ReSharper.  You can learn more about ReSharper by viewing Luke Hutteman's and Michael Yuan's blog posts  to get their first impressions.  ReSharper is currently in the early access program, so you should be able to download and test drive for yourselves.  It would be interesting to see how these compare against other add-ins that provide refactoring in Visual Studio like: