I recently noticed that the ThematicPowerblog theme has dynamically generated classes in the body tag (perhaps elsewhere too?). I actually thought it was a bug when I saw all the text generated based on the tags, categories, date, browser type and version, and other properties of my post. I asked Ian about it and he said it was a "feature", not a bug. Okay.
I understand how one could use these classes to apply different formatting to, say posts created according to year, or month or season. Or different formatting depending on the category, etc. But I can't think of too many actual, real world uses for this feature outside of that. And even those examples I can't really ever see myself using.
So my question is... how do YOU use these dynamically generated CSS classes? If you do, that is. I'm looking for real world examples, or useful ideas that would have some benefit in real world cases even if you haven't actually implemented them.
I'm looking to expand my way of thinking about it here because I can't see the point of this feature, I'd rather have clean code and lose the bloat. But I've noticed that several other themes seem to do this as well. Which makes me think I'm missing the usefulness of this feature. So let me know what cool things you are doing with these dynamically generated classes, or have thought of doing.