Samuel Ball Platner's "A Topographical Dictionary of Ancient Rome" from 1929 is still a valuable resource on the monuments of ancient Rome. LacusCurtius features major parts of the work, searchable and extensively interlinked.
Ancient Rome - a forum for contributions from interested parties updated regularly. Information on many aspects of roman life, including - trade in amphorae with Britain, internal politics, roman classes, relations between the senate, people and institutions. 3d models, images of ancient Rome. Links to other sites and newsgroups