The following site is recommended for professional genealogical research in Malta:
http://www.genealogyservicesmalta.com/
Some of the more important non-commercial genealogical sites are listed here.
Genealogie delle dinastie italiane by Davide Shamà and Andrea Dominici Battelli
Genealogy.eu by Miroslav MAREK
Paul Theroff’s Royal Genealogy Site
Italian Titles of Nobility and Genealogy
José Verheecke’s Genealogical Site
Malta Genealogy.com by Charles Said Vassallo
Messina and its connection with the Maltese Nobility
Maltesenobility.org – a website dedicated to the history of Maltese Noble families and Nobility in Malta
Notarial List – Malta
The Order of St John – A Genealogical Table