I just saw that Albert Weinert has upgraded the MbUnit test runner plugin to work in ReSharper 4.0, sweet! Since ReSharper 4.0 is still in pre-beta, there is no guarantee that it will work at all, but I'm running the latest nightly builds and IMO its getting more stable every day. I verified that the MbUnit test runner plugin does work by installing it on against ReSharper 4.0 build 758 and opening the Subtext 1.9 Branch source code. The image to the left shows the ReSharper Unit Test Explorer open and displaying the MbUnit tests from Subtext. ...