Area Guides.net
Offers a good introduction to all of Rome's major attractions, landmarks and parks.
http://romeit.ags.myareaguide.com/index.html?CatID=2&SC=17

Capotilium.org
An online guide to Rome's Imperial Forum.
http://www.capitolium.org/

Culturalweb.it
Italian arts and culture guide. Mostly in Italian.
http://www.culturalweb.it/

Exibart.com
Online guide to art exhibitions nationwide.
http://www.exibart.com/primainglese.asp

Go Porta.com
Book tickets to Italian museums online.
http://www.goporta.com/

Live in Rome & Italy
Includes primers on museums, monuments and archaeological sites around the city.
http://www.liveinrome.com/museums.htm

Musei Online
Search for museums, exhibitions and events all over the country using this site.
http://www.museionline.it/

Museum Pass
Specializes in low cost museum and transport passes and city tours of Rome.
http://www.museumpass.com/

Piazza di Spagna
Tourist information about the Spanish Steps.
http://www.piazzadispagna.it/

Pierreci
An art and culture guide that lists current exhibitions and details major museums and monuments in the city.
http://www.pierreci.it/

Roma 2000
Gives you the lowdown on Rome's main museums and monuments.
http://www.roma2000.it/english.htm

Roma Sotterranea
Web guide to Rome's underground sights.
http://www.underome.com/

Roman Homes
List notable art galleries in the Eternal City.
http://www.romanhomes.com/why_rome/art_galleries.htm

Romaturismo.it
Suggested itineraries for sightseeing in Rome, if you are visiting for 48 or 96 hours.
http://www.romaturismo.com/

Rome Central
A rundown of the city's best museums.
http://www.romecentral.com/visiting_museum_list.php

Rome Museums and Galleries
Rome gallery guide.
http://www.rome-galleries.com/

Select Italy
Arranges advance reservations to many of Italy's popular art and archeological museums.
http://selectitaly.com/

Stuardt Clarke's Rome
A personal guide to the best museums and galleries in town.
http://www.stuardtclarkesrome.com/museums.htm

The Colosseum
Find out more about the greatest amphitheatre in the world.
http://www.the-colosseum.net/

The Holy See
Official source of information about the Vatican and its attractions.
http://www.vatican.va/

Travelplan.it
Advice on how to explore Rome in weekend.
http://www.travelplan.it/rome_guide_itineraries_weekend.htm

Weekend a Roma
Book tickets to Rome museums, galleries and tours with this agency.
http://www.weekendaroma.com/

World Guides
Find out which museums, galleries, attractions and parks in Rome are really worth visiting.
http://www.rome.world-guides.com/attractions.html