I seen some very good posts on this that include project and reg files necessary to set this up, however I run Vista 64 and found that the reg files didn't work for me. So after a poke around the registry I came up with the following two reg files that have done the trick for me. One for Visual Basic and one for C#.

If you want a complete description on how to register a custom testing framework with Visual Studio for use with ASP.Net MVC check out either of these links.

• http://blogs.msdn.com/webdevtools/archive/2008/03/06/asp-net-mvc-test-framework-integration-demo.aspx (This one includes project and reg files)
  
• http://blogs.msdn.com/webdevtools/archive/2008/02/18/asp-net-mvc-test-framework-integration.aspx

This zip file contains registry keys for C# and VB.NET: