TestDriven.NET is a freely available tool which makes it easy to run NUnit developer tests with a single click, anywhere in Visual Studio solutions. The tool can be found at http://www.testdriven.net.

With the tool installed, once a NUnit test case has been defined, simply right click and select the Run Test(s) item and TestDriven.NET will run that test only. TestDriven.NET also supports running tests are different aggregation levels depending on where one right clicks.

This is a handy tool worth downloading!