Well, most of my faves are on there, but JohnnyG's got Transcending Time, but technically, that isn't a fukufic either, but it involves a magic Ranma of sorts....
http://www.fanfiction.net/s/2357156/1/Other than that, it's true that less and less are being written. Hopefully it's only the depression before the war, and not an economic collapse.
Oh, all the small things by Slacker, too.
http://www.ranmafics.com/Sailor_Moon/All_The_Small_Things/index.htmlOoh, lost the link, I'll see if I can dig it up, but Kaiba Saotome, where Ranma combines with Mercury and Akane combines with Mars.
And as much as I hate locked and pregnant Ranma, Trimatter's Aftermath was interesting in its weirdness. (hmm, I'll have to clear out my favorites. I can't find that one either.)
What, ranger5's Forever the Tomboy's Not Here yet?
http://www.ranmafics.com/Sailor_Moon/Forever_the_Tomboy/index.html(Or his FF page...)
I know Just a Plan by Poly is technically not a true fuku, but it's as close as one can get....
http://www.ranmafics.com/Just_Plan/index.htmlEDIT:
Gabriel Blessing's Wild Time is a favorite of mine. The flip-flop is done near perfectly.
http://www.ranmafics.com/Wild_Times/index.htmlIf I remember any other decent ones, I'll edit them in.
Later,
MV