Remove unused references

Resharper will certainly do the trick...

I am unaware of such a tool off the top of my head - I do know that Visual Studio does not include one by default. However, referenced assemblies that are not actually used by code in the project are automatically removed by the C# compiler from the list of assemblies referenced by the compiled program. If you use Reflector, you can compare the list of actual references to the list of references in the project, and remove the unnecessary ones that the project includes based on that.