New TestDriven.Net, RAIL, MbUnit
I ran into an announcement of TestDriven.Net's v1.0 release at Steve Maine's blog.
During installing it, I figured I would take a look at MbUnit which is installed with it. Many, if not all of the tutorials on MbUnit's project home page lead to Jonathan de Halleux's blog, and specifically led to this article, where I discovered RAIL (Runtime Assembly Instrumentation Library). I have every intention of going back and reading about all of these things in detail.
I also found out that something called NUnitForms exists. I'll have to see if it's any use.