Having recently gotten into test driven development I am using the Nunit test runner shipped as part of resharper. It has some downsides in terms of there is no shortcut to run tests and I have to go looking for the Nunit test runner to invoke it using the mouse. It has a nice GUI and shows the results as part of the IDE well.
What do other people use for running unit tests against .net projects? I have googled other apps including MBUnit and the Unit test App from Nunit.org and wondered what comes out on top for people.