I just found another plugin for ReSharper called "ReSharper TDD Productivity Plugin".
I'm not going to write about it here as I have nothing to do with the development, I'm just helping the author promote the plugin
Have a look at it here: http://code.google.com/p/resharper-tdd-productivity-plugin
The latest version even supports version 4.5
Oh, and BTW JetBrains, perhaps you could add this plugin to the page og plugins for ReSharper?
Kenneth Siewers Møller