What is your surname there? I found that same site 2 years ago and found useful info on one of my surnames (Scrugli). Found 2 long articles on Scrugli's there that look promising. I currently have a microfilm from Tropea from the LDS. If it would help you I can keep an eye out for your surname.
Of course, I don't know who these people are. It is too far back for em right now. My Insarda family is from Feroletto della Chiesa, Reggio Calabria.
I did some reading and did find that notaries kept personal indicies of all of the documents that they prepared. I guess at some point when the notary died, these indicies would be given to the town and would serve as an index to their papers. I read about this in an Italian genealogy book. Right now, I am foggy on the details.