The present contribution discusses various selected concepts and criteria of “Digital Cities” which have been worked out by the scientific community. CUMINCAD (see http://cumincad.scix.net) provides an excellent resource of contributions which have been discussed within the scientific community throughout many years and is being used as main source for distilling various ideas and concepts of “Digital Cities”. Additionally the Austrian CORP-database (see http://www.corp.at) was used as a data source. This (small) “collection of resources” shall contribute to further the discussion and the development of useful concepts and standards concerning “Digital Cities” resp. “Virtual City Models”.