Well, the discussion about the "kind of categories" missed a very important
one:
Categories used to group wikipedians by poitical/religious beliefs
like
[[Category:Muslim Wikipedians]]
[[Category:Born-again Christian Wikipedians]]
[[Category:Flying Spaghetti Monsterist Wikipedians]]
[[Category:Roman Catholic Wikipedians]]
etc which are sometimes used to raise voting blocks.
The emphasis on "this user is/believes foo" is quite different from "this
user is interested in foo".
if I recall correctly, categories as the ones I mentiones above are not
welcome on wikipedia, but I may be wrong.
Can someone else please give me mroe feedback? Maybe previous discussions,
statements by jimbo or arbcom, etc...
Otherwise, I'm depopulating such categories (which over 95% of them are done
via userboxes) and removing them afterwards.