Atlasgeo: Italy: Animated GIF image.
Flag of Sicily [geographic.org]: Thumbnail, small and large GIF images of the flag of Sicily, suitable for use on web pages, which the author permits.
Flags of the World: Italy: National, subnational, historical, political, and military flags.
The History of the Italian Flag: Information on the flag's adoption and changes over the years.
Theodora.com: Flag of Italy: Images in several sizes.