Visual Nunit is NUnit integration for Visual Studio 2008. Provides convenient view to test cases and enables debugging tests easily inside development environment. Implemented as Visual Studio Integration Package. IRC: irc.freenode.net #visualnunit
I use Visual NUnit with Visual Studio 2008 and 2010. It works well and unobtrusively.
It is easy to select and run a single test, one fixture worth of tests, one package worth of tests, or all tests in the solution.
It is easy to debug a single test (by clicking on the test icon).
The integration with Visual Studio is seamless. I highly recommend.