tass.org
Lots of Ranma 1/2 stories. Some are good, some are bad but it's many
hours worth of reading for the poor fanfic addicted souls like
myself. ^_^
Hearts of Ice
I can't give this story enough credit for it's insightfulness and ingenuity. Just read the first chapter and you'll be hooked. I promise!
Ranma translations
You want to read a translated version of the best series in the world?
Go here to find the translation of Ranma 1/2 comic series! This
is a must see for any Ranma 1/2 fan!
Akane.org Lots of stories. Some are non-Ranma but still very good.