I got the source code for FlexWiki to compile. Yippee! Just had a little struggle with the source code control and one of the subprojects but I just removed it from the solution and everything was fine. As part of the compile, I had to installed Nunit.
I was a little wary that any testing framework would be a pain to work with but I was really impressed with how easy Nunit installed and just worked. Ran the test suite without a hitch. It's a great example of using Attributes in .Net. I fully believe test-driven development is a great way to go and Nunit is a no-brainer.
I'm hoping to modify FlexWiki so I can create a custom header and integrate it a bit with .Text.