A while ago, one of the lists was discussing "technical" categories for articles. As far as I remember, many liked the idea to mark, for example, a biography as such, so all biographies could be listed automatically, searches could be limited to biographies, etc.

Nothing was ever heard of since.

It seems especially the Germans have a tendency for these categories. They have lists which they keep up-to-date manually, but IMHO they'll fail in the near future.

I put my proposal on meta (http://meta.wikipedia.com/wiki.phtml?title=Technical_categories_in_Wikipedia). Please comment and develop.

Magnus