Today, we issued a refresh build for xUnit.net RC2.
There were a couple significant issues that we wanted to fix. First, we'd been having some strange behavior regarding TestDriven.net which we finally tracked down; second, we had an issue when we merged the source code for the extensions project which caused the MSBuild task to be broken.
Additionally, we've started work on a GUI runner which is included in the refresh. The actual GUI that you see today is just a placeholder on the way to the eventual GUI runner, so it's very rough. Today, you can use the GUI to run all the tests in an assembly; in addition, it doesn't lock the assembly, so you can leave the GUI open while building with Visual Studio (it even reloads the assembly when it detects that it has been changed).
Onwards toward the 1.0 release!
Update: We released support for ASP.NET MVC Preview 2 as well today!