In the DotNetRocks podcast with Aslan Kahn, I figured I should go look at the mans blog. On there I found mention of a tool, that I had not heard of - Cucumber. The next week, I attended a meeting of the Atlanta ALT.NET group and the presentation on FluentNhibernate - also showed an example of Cucubmer. A very english looking business description to write out test cases.
Aslan Kahn gave a presentation at the SPIN meeting in South Africa and he mentioned that the Cucubmer site starting get a whole lot of activity.
I went out and found where you can find Cucumber.
There is a book to be released this year "The RSpec Book: Behaviour Driven Development with RSpec, Cucumber, and Friends" - from Pragmatic Press (The Pragamatic Programmer is something you should read if you have not).
Cucumber has a Ruby background to it - check out the website to get more info.
I did find an article about Cucumber with a focus on how it can be used in the development process.