1. Ranma and Akane kisses: how many? I know these two:
        1. Anime & Manga: Cat Fu-- Ranma kisses her as a cat.
        2. Anime & Manga: Ranma and Juliet-- gum-taped kiss.

  Those are the only ones I know of, too.  They almost kiss after the 
skating match, when they're sitting alone in the dojo.  (Or amybe they 
_don't_ almost kiss.  They're interrupted, so we'll never know.)

They almost kiss heaps of times at the end of the manga... just look
at the high 20s manga and all the 30s ones. ^_^

2. Ranma kissed by OTHER people: how many? I can only think of two:
        1. Anime & Manga: Shampoo's 2nd kiss of death (to the boy Ranma).

  Huh?  She doesn't give boy Ranma the KoD.  She gives it to onna-Ranma 
when they're at the village.  When Shampoo later shows up at the Tendo's and 
Ranma 'defeats' her, she glomps him, but I don't think she kisses him 
there.  (all that's Manga, btw)

Kiss of marriage = kiss of death for Ranma. ^_^

  Manga: (I haven't seen the anime for this ep) In the skating match, Azusa 
kisses him on the nose.

Manga: Shampoo kisses Ranma on the cheek when he's a little boy in manga
34 (or was it 33?)

3. Ryouga kisses: has he ever been? even by Ranma in girl-form-disguised as
a joke (or like in the koi-fishing-rod story?

  I haven't seen or read it, but from reading the manga synopses, I think 
Ryoga is kissed by onna-Ranma (which is, I believe, in the koi-rod 
story).  This made Ryoga very upset, because he wanted his first kiss to 
be with a _girl_ (very understandable!).
  If I'm wrong here, somebody _please_ correct me!  Kev? Chris?

Yep, Ranma kisses him (though I can't remember if it was on the lips)
and Ryouga goes balistic.

Kun-chan...