Perhaps just category intersection isn't enough. I was thinking about a tool that would allow intersection of various article data, including the categories.
For example, suppose that I am maintaining [[1991 in art]]. I would want to find all articles that link to [[1991]] and are in a subcategory of [[:Category:Visual arts]]. And don't even get me started about what could be done if template parameters would be recorder somewhere...
Is anybody actually reading what I write? Skimming apparently does not cut it!
Go to http://toolserver.org/~dschwen/intersection/
It does precisely that. Category-intersection plus Link-intersection. Also see:
http://en.wikipedia.org/wiki/Wikipedia:Link_intersection http://en.wikipedia.org/wiki/Wikipedia:Category_intersection