<p>I am getting back into a bit more .NET after a few-years of not using it full-time and am wondering what the good unit testing packages are these days.</p>
<p>I'm familiar with NUnit (a few years ago) and have played briefly around with <a href="https://en.wikipedia.org/wiki/IronRuby" rel="nofollow noreferrer">IronRuby</a>, with the goal of getting something like <a href="https://en.wikipedia.org/wiki/RSpec" rel="nofollow noreferrer">RSpec</a> going, but I don't know much beyond that.</p>
<p>I realize I could google for this and call it a day, but I believe I'm likely to get a better and more informed response from asking a question here :-)</p>
<p>Suggestions?</p>

I like
MbUnit
, er,
Gallio
.  Most importantly to me is having good tools support inside Visual Studio.  For that I use
Resharper
, which has an
MbUnit test runner
.  A lot of folks seem to like
TestDriven.NET
as their test runner as well.