I\'m looking to introduce a unit testing framework into the mix at my job. We\'re using Visual Studio 2005 (though we may be moving to 2008 within the next six months) and
Try also the PEX tool.
It's Microsoft's own, probably soon to be integrated into VSTS. It does support NUnit, MbUnit and xUnit.net.
I also use a small console application for testing one class or a small library. You could copy paste the code from here.