I get the impression that many TopStyle users aren’t aware of the “Site Reports,” which is a shame because they’re extremely useful.

The Site Reports enable you to see where styles are used (or misused) in your site. For example, you can find out where you’ve applied CSS classes that aren’t defined in any style sheets, or see what style classes you’ve defined that aren’t being used anywhere in your site.

Here’s a screenshot of this feature in action.