MbUnit continues to do great things. I just stumbled across a discussion on the MbUnit Google Group talking about a new feature in 2.4.143: the ability to test private methods via some nifty-looking reflection work.
Whoof! This is just plain amazing stuff, and a terrific benefit.
Sure, you can get in to the discussion about whether or not you should be testing private methods at all, but 1) some folks have to deal with poorly designed leprosy I mean legacy systems, and 2) sometimes you just end up with code which has private methods you’d really like to test separately from their invoking public methods.