On a lot of projects, I use NUnit for unit testing, usually I create a separate project that contains only the tests.
There tools that integrate fully with the Visual Studio, like ReSharper or TestDriven.NET, but they cost money and you can’t run them on Express editions.
So I’ve made this useful shortcut to easily run it for the current (test) project. Screenshots are made on Microsoft Visual Studio 2010 Professional running on Windows 7.