Time Out (english-language events guide)

http://www.timeout.com/rome/

National Italian Railways

http://www.trenitalia.it/home/en/

Rome Preview (content heavy cultural events)

http://www.romaonline.it/

Roma Civica Net

http://www.romacivica.net/

Vatican City

http://www.vatican.va

ATAC, Rome's Transportation Agency

http://www.atac.roma.it/

Autostrade, highway system in Italy

http://www.autostrade.it/

Italian Senate

http://www.senato.it/

International Catacombs Society

http://www.catacombsociety.org/