In the past few days I added javascripts which traverse weblog views and add conveninece links - split category links fall out of that
A few days ago I cleaned out as much link-load as possible from the aggregate blog views, and then added javascripts which traverse the DOM after page load and insert a lot of conveneience links. This includes category links, split by subcategory ( without javascript, aggregate views do not have links rfor categories at all ).
Still need to do something similar for single-entry view, which still has links for categories rendered into the html of the page.