Actually, all I'm interested in are fanfics that takes advantage of 
the last developments in the series. 

Really limits you.  And what were the later developments anyway?

Akari - a nice girl and good character, but the sumo pigs are just silly, 
without being funny.  Her relationship with Ryouga is good, particularly 
in how Ryouga vacillates between her and Akane.

Konatsu - awful character.  Tsubasa recycled in an even less appealling 
format.  Rates with Happosai as a bad idea (IMHO).  

But Konatsu's much more attractive than Tsubasa! He's a bishounen!

Nodoka meets Ranma - Had to happen and an important event.  Be nice if 
Takahashi had been less mediocre in her story about it.  The only real 
situational change.

Jusenkyo destroyed - Important event of long term relvance to Ranma.  
Exactly how Ranma chooses to react to it might be an interesting topic, 
in the manga he never really had time to think about it, or was never 
shown thinking about it.

Ranma does say that he didn't even think about destroying Jyusenkyou,
because he only wanted the water to save Akane's life. So, it seems that
he did think about it... That he placed Akane above getting a cure.

The almost marriage - Marks another incremental change to Ranma and 
Akanes relationship, but in the end fails to cause a signifigant 
alteration of the situation.  Ranma & Akane still fight (maybe not as 
badly...) and their other suitors still circle patiently.

It shows that Akane is willing to marry Ranma, and the part where Ranma
thinks that Akane's dead shows that he admits that he loves Akane. The
wedding also goes to show that Ranma will probably ends up hating Shampoo
and Ukyou for trying to kill Akane. And Ryouga gave up on Akane. The only
ones the same are Kodachi and Kunou... they're too insane to change.

Kun-chan...