Ok, I got a few responses, here are the results.
http://waxwolf.com/plucky/
http://www.geocities.com/Tokyo/Pagoda/8075/ <-- Seems kind of
outdated. Some fics don't pair either Ranma or Ranko with Ryouga (ie,
Ryouga + Ukyou).
http://mx8.xoom.com/Alatri/Fiction/Ranma/Ranma.htm
This only has Genma's Daughter listed, but since Red Death might
update it any time, it's worth to remember.
http://www.angelfire.com/anime2/superhighway/mile.html
And this is mostly (hell, just about all) yaoi. That's fair warning.
http://adult.dencity.com/kirarose/welcome.html
The only other fic that I know of that is not shown in here (other
than a few occasional lemons, such as Yet Another Ranma Lemon), is
Cast a Second Line into the Sea, both of which may be found at the
http://fanfic.tass-anime.com archive.
Anyway, I wanted to post this before the FFML (maybe) goes down
(forever and ever), just in case there were those interested in
knowing the results.
SCT