I noted on my .NET Test Driven Development article that I had problems getting TestRunner to work with NUnit v2.1.
Well all that has changed now. Will Ballard sent me an email saying the he had updated TestRunner to play nice with the stock NUnit 2.1 and uploaded it to the site. I downloaded it late last night, and now it works. Here's a screenshot (note that this is inside Visual Studio!):

You gotta love the .NET community!