The first 11 addresses below are links; just click to reach the sites:
The Ultimate Beginners Guide to Geneology Research
Mapcon Geneology Online Resources
Geneology Bank's Discovering Italian-American Ancestry   
Cyndi's List
My Italian Family
Ellis Island, Castle Garden, Ship Arrival Searches
Italgen--Italian Geneology Online
The lasting impact of Italian immigration on American culture
Get Italian Citizenship
25 Best Geneology Sites

OK, This one is a little off the subject, but was recommended by a knowledgeable website visitor:
Research The History of a HOUSE!

As of
4/15/2021 the following likely worthwhile organization does not appear to have updated the security status of site ("Discover your Family's Story") to meet new requirements of some browsers. If you choose to assume whatever risk there might be to view the site, you can copy the address and paste it into your browser: