This contribution is supposed to improve the look and feel of the categories box, improve navigation and help users to keep their bearings on the site.
1. It will add a small image ('bullet') to the left of every category in the category box. There are two different images, one for categories that have subcategories, one for those that don't.
2. It will get rid of the funny-looking ASCII-arrow ( -> ) that used to indicate categories containing subcategories.
3. It will highlight the current category in the box. Users will have an easier time telling where they are on the site.
Here's a screenshot of what the box will look like in an otherise standard 2.2 MS2 installation: