http://en.wikipedia.org/w/index.php?title=Wikipedia:Redirect/DeletionReasons&diff=82631387&oldid=81822646
    Changed on October 20, 2006, to state that cross-name-redirects can only be deleted if they are
    likely to conflict with a real article.

http://en.wikipedia.org/w/index.php?title=Wikipedia:Cross-namespace_redirects&diff=74440945&oldid=71142464
    [[WP:CNR]] marked {{historical}} on September 8, 2006





Issues with cross-namespace redirects:
    - a mirror site (or otherwise) who downloads a dump that doesn't include Wikipedia: space or
      User: space will get a lot of redirects that don't work