NUnit 2.0 RC1 available. Highlights of the updated unit testing framework for .NET:
- Attribute based mechanism for identifying test fixtures and test methods.
- Automatic creation of test suites.
- Improved GUI runner allowing dynamic reloading of test assemblies.
- The Console runner supports XML output.
- Mostly backward compatible with NUnit 1.0. [sellsbrothers.com: Windows Developer News]

On a related note, I'm packaging up v0.9 of .NETUnit right now. There are some major updates in this release, but most of the are on the framework side. The most important thing for the average developer that's new to this release is the console test driver. It supports executing single test fixtures, whole test assemblies and pre-defined tests which can be written by hand in XML. The console test driver also optionally generates an XML report which you can then run through an XSLT to generate a report.

Coming down the pipe I have a GUI test driver, GUI test builder and full VS.NET integration. The test builder will enable simpler creation and manipulation of test suites which currently has to be done with your XML editor of choice.