Australian Embassy in Rome
Lost property and credit card company contact numbers.
http://www.australian-embassy.it/consular_4.html

Enjoy Rome
Notes on ATM's and currency exchange shops in the city.
http://www.enjoyrome.com/tourist/cityguide/money.html

Informer.it
Tells you everything you need to know about banking and financial services in Italy, even down to writing numbers as the locals do.
http://www.informer.it/index.asp?Page=banking

Italy Hotels_Rome.com
Banks and ATM's in Rome.
http://www.italyhotels-rome.com/tourist_info/banks.htm

Let's Go
A shortlist of banks in the city.
http://www.letsgo.com/ROMA/14-ServiceDirectory-21

Rome Central
The bare essentials of lost credit cards, banks and cash machines in Italy explained.
http://www.romecentral.com/banking.php

The Euro: Our Currency
Everything you need to know about the single currency courtesy of an official source.
http://europa.eu.int/euro/entry.html

US Embassy
Advice on how to cancel lost/stolen credit cards, airline tickets, travellers checks and student cards when in Rome. Aimed at Americans, but useful to all.
http://www.usembassy.it/cons/acs/stolen.htm