Hi, Justyou!
Well, I'll do my best to be clear. If you don't understand some of my "strange" sentences, please tell me! (where the hell is my English dictionnary?? ).
I don't really know if there is a great difference between the two sorts of kisses. On this web page (which is very intresting, because they explain with the words of Tommaso Buscetta - the first "pentito" - Cosa Nostra's rituals), they say that before killing a betrayer, the hired assassins exchanged between themselves a "kiss of death".
On the other side, there's a kiss on the lips (which had become legendary in Italy, even if it is absolutely not true) between Giulio Andreotti (a politician of ours - the sentence we listen in GF III: "Il potere logora chi non ce l'ha" is his) and the well-known boss Totò Riina. That would be a sign of great rispect, a sort of ritual pact.

Let's talk about Italian links. I've found these.
- http://www.almanaccodeimisteri.info/mafia2004.htm
very intresting if you look for specific news in the past years
- http://www.fionline.it/mafie/
this web-site is quite intresting for analizing the different mafie (Cosa Nostra, 'Ndrangheta, Camorra, and so on...)
- http://www.antimafiaduemila.com/
there's the web page of a newspaper which talk about Cosa Nostra; there's also an archive. it seems to me quite complete.

That's it!
See you.