Well… we are waiting it since looong time, but now it is ready.
Here is the Charlie’s post.
Here de documentation.
This new release has a lot of new features as Theory, parameterized tests (here and here), parallel testing, and many others very useful features (pay attention to each new attribute).
What you are waiting for ? Download and try NUnit2.5RC1right now.
And remember to take a look to the new test runner ;)