Hoi, Big categories were a big systems problem. In order to make this problem manageable, the amount or articles that are shown at a time have been limited to 200 at a time. This proved to be rather akward when you want to find an article one starting with an character at the end of the alphabet. MukeUTF-8 (nick on IRC) came up with a simple elegant solution. He created some code to have a Table of Content (TOC) and hid it in a template. The first implementation is in http://la.wiktionary.org/wiki/Category:Lingua_Latina http://la.wiktionary.org/wiki/Category:Lingua_Latina and uses Template:Categorytoc This is a template for use from A to Z.
On the nl:wiktionary we have lower case characters so the code was expanded in Sjabloon:CategorieTOC and it can be seen at work in http://nl.wiktionary.org/wiki/Categorie:Woorden_in_het_Nederlands http://nl.wiktionary.org/wiki/Categorie:Woorden_in_het_Nederlands I have also implemented a Template:CategoryTOC (AZaz) in Commons and a Template:CategoriaTOC http://it.wiktionary.org/wiki/Template:CategoriaTOC in the Italian wiktioanry.
My thanks go out to Muke, this is a great improvement on the usability for categories :)
Thanks, GerardM http://nl.wiktionary.org/wiki/Categorie:Woorden_in_het_Nederlands