Duplication is probably the easiest mistake to make with CSS, and using authoring languages like LESS and SASS won't necessarily help. Duplication not only causes bloat, but it can lead to specificity wars and poorly performing selectors. Worse yet, it becomes more difficult to trust the code already in place, and easier to write your own styles to perform tasks that some other code already handles.

This is the death spiral of CSS, and it's refreshing to see someone take on this problem directly (aside from teaching a methodology for writing CSS).

Automated documentation for CSS is a fantastic idea, and this looks well executed.