Italian manners and customs (written for British travelers but great for everyone) http://www.italyheaven.co.uk/manners.html

Rome's airport
http://www.rome-airport.info/

Notable shopping streets and areas in Rome
http://www.fodors.com/miniguides/mgresults.cfm?destination=rome@130&cur_section=sho&sort=category&review=full&pg=17

Trains throughout Italy
http://www.ferroviedellostato.it/   

Day trips from Rome
http://goitaly.about.com/od/romeitaly/tp/rome-daytrips.htm

3-D virtual tour of Ancient Rome
http://www.unicaen.fr/rome/index.php

Guide to the dozens of fountains in Rome
http://www.romeartlover.it/Fountain.html

Learning the language
http://www.fodors.com/language/llresults.cfm?lid=3&cid=14

The Vatican and The Holy See
http://www.vatican.va/

Rome tourist information
http://www.rome.world-guides.com/

Italian Government Tourist Board
http://www.italiantourism.com/

The Imperial Forums of Rome
http://www.romaviva.com/Fori-Imperiali/imperial-forums.htm

The Keats-Shelley House in Rome
http://www.keats-shelley-house.org/

Getting around Rome by bus and tram (with point to point search function)
http://www.atac.roma.it/index.asp?lng=2

Rome museums and galleries
http://www.rome-galleries.com/

Official site of Capitoline Museums in Rome
http://www.museicapitolini.org/en/index_msie.htm

Currency exchange rates
http://www.x-rates.com/

Websites for lowest airfares
http://airtravel.about.com/od/travelplanning/a/Savingyoumoney.htm