At a glance, I think removing the alpha headers for category/article lists would be a step in the right direction in terms of readability and useability. For longer lists, sure add a formatting control option to break it up. But most of what I see on the site now consists of short lists, and the alpha sectional breaks just make it harder to find/read what you want.
The majority of the page is blank, spaced out with the alpha headers where in most cases it's not necessary to break the page up (as the lists are relatively short). Would look much better, and be infinitely more useable if it were just:
Articles in category "Vocations"
There are 7 articles in this category.
Plenty of other similar category/article lists would benefit by the change.