I just went and created two new lists at the above page:
http://www.aikiweb.com/wiki/people/highrankingwomen - Aikido female yudansha with ranks at or above 6th dan.
http://www.aikiweb.com/wiki/people/nonjapanese - Non-Japanese aikido yudansha with ranks at or above 7th dan
Neither list is complete nor intended to be totally accurate. The first list I created off the top of my head (with a bit of research), and the second list was last maintained by the late Ubaldo Alcantara.
Here's your chance, folks, to help bring this list comprehensive and up-to-date!
-- Jun