The use of databases in archaeology is based mainly on the need for a kind of data storage that can both optimize techniques and times for the management of excavation documentation and allow integrated access to all the information collected. In this paper we have described the modelling and development of a web-based system allowing cataloguing, storage and retrieval of different information types. Specifically the system employs PostgreSQL 8.1 as open source Database Management System (DBMS) for repository deploying and managing and Web 2.0 technologies (AJAX, XHTML, etc.) for development of a graphical interface strongly oriented to improve effective user/system interaction.