I'm having trouble finding the article I wanted to reference for this, so bear with me. :)
ncrunch / continuous testing helps lower the mental barrier to running tests, but for people not used to TDD (or even testing), it's not a very 'engaging' experience.
There's already been some areas of development where gamification has been used well (for instance, perf, specifically frame rate, of a game did better after one of the developers put a happy/sad face next to (or instead of, I don't remember) the frame rate indicator.
Similarly, I think code coverage is something where the raw numbers are a little too boring and some emotional attachment would help developers, especially those less familiar/inclined to testing.
This certainly isn't a new thought, there's already others trying something similar (going back to things like a version of Doom for 'killing' bugs), but NCrunch seems like it's potentially in a position to either adopt something like this, or expose it as an extensibility point for others.