I prefer YAML, also. It has the high signal-to-noise ratio of traditional config files, while also providing an elegant way of representing heirarchical data -- even quite complex data. And the reference support is cool, too. And I like Ingy's YAML module.

But then, I tend to see the world monochromatically... I tend to grab one tool (a hammer) and view the rest of the world as a nail...

And while I'm thinking about it, I'll reference a warning in this thread: 347905