Something I’ve just been trying out…
The size and colour of the category names are related to the number of posts in that category. Each category name is also a link and can be used to browse the posts contained within that category.
If you refresh the page, you get a new, randomly generated map.
I think the map gets more interesting when there is a greater number of posts on the site and the relative differences in category size gets more pronounced.
I have posted some comments the plugin’s website, about how the map could be taken further.