Following is a link you might enjoy:
http://search.yahoo.com/search?p=great+sausage+recipes&ei=UTF-8&fr=sfp&n=20&fl=0&x=wrt
I have never heard that procuitti are aged underground! The food network's Mario Batalli visited an Italian procuitti "factory" and there were literally 1000's of hams being air dried after curing (and/ or smoking..I don't remember!)
The book: "Great Sausage Recipes and Meat Curing" by Rytek Kutas has a recipe for making your own prociutti. I have tried it, but our climate is not condusive.....(we're in the hot and humid Gulf Coast area.....
It is both salted (cured) and then smoked according to that recipe.
My result was edible, kinda, sorta reminiscent of prociutti, (hahaha)but much too dry......I may try again once we get some cooler weather, as in November/December perhaps....
Good luck and let us know if you try it.....What climate are you in?