Help talk:Introduction to Templates
Info table categories
All the templates for the standard info sheets (e.g. Template:Infobox Machine) used to automatically stick things in a category. For 'Machine', this was somewhat useless, since it used Category:Computers, which is totally generic, and most such pages have a more targeted category, e.g. Category:DEC Systems, or a sub-category thereof. I have thefore removed that category (for now).
The OS template also no longer auto-adds. I think this is better, because e.g. Category:DEC Operating Systems is included in Category:Operating Systems, so every article correctly tagged with the most specific category is still findable from these top-level categories.
Also, as a matter of style, I don't like automagically adding categories in a way that's not explicit in the article source; I think category inclusion (with some limited exceptions, like Category:Stub Articles) should be explicit, and under the full control of the article source.