Slight correction at the end here and a few opinions thrown in:

What's the name of the fic where Ranma is left to be raised by the
Tendos, and Kasumi goes off with Genma and comes back Ranma-fied?

Nightman

"A Scary Thought"

An Altered Destiny written alongside "A Very Scary Thought" "Switching 
Heirs" "Most Unlikley of Friends" "A Little Motherly Love" and "Odd 
Outcome"

All are at:  
http://www.fortunecity.com/lavendar/attenborough/249/index.htm
To my knowledge all were written by Derek Loffin.

Close. Everything is correct except for that last line. Derek Loffin is a
character in several of the fics that is responsible for the altered
destinies. Since the owner of the hompage is not on the list, allow me to
make a few clarifications. 

There are various authors for the fics mentioned. Now this is my
opportunity to insert a few brief opinons of them. (I could go on quite
some time about some of these, but I shall endeavor to keep my accolades to
a minimum.)


Most Unlikely of Friends
A Scary Thought
Odd Outcome (on the page but not an Altered Destiny)

Author: Wade Tritschler

D.B.: Simply put, MUOF and AST are quite possibly my favorite series. I
admit that alternate universe stories are my favorite genre, which makes me
a little biased towards tales such as these, but I believe they are well
worth anyone and everyone's time to read.I could go on about these for
quite a while, but I'll leave it at 'reading them is a definite must.' 


A Very Scary Thought 

Author: Jim Robert Bader

Templated off of AST's universe, it quickly seperates into its own world
with several, how shall we say, uncommon resolutions to the romantic
problems that plague this universe. I would describe Bader's style as a bit
different, but this series too, I feel, is well worth the read. (Yes.
You'll recognize some characters between Shampoo 1/2 and AVST. We've
borrowed ideas from one another.) 

On a side note he also churns out stuff about three times faster than me,
yet doesn't sacrifice quality. It's damn near unbelievable. He also has
several other series and stories that are not posted on the net which you
can ask him about. His email address is on the above webpage, along with
the other authors.


A Little Motherly Love

Author: Celeste Byrd

Haven't read that one in a while and it was only five chapters, two of them
in the process of being edited, so I can't say much about it.


Switching Heirs

Author: Dreiser

This one is newer and being posted to the FFML, so you can read and judge
it for yourselves. From what I've read it looks promising.

Well, that's enough out of me. Back to revising chapter 33.

D.B. Sommer