In this paper, we detail specifications of a Visualization On-Demand (VizOD) server. We show that packaging information visualization processes into services reachable over a network benefits both users and programmers, by reducing development cycles. We implemented a prototype based on our architecture, resulting in an innovative way to visually explore large movie database. We discuss early results and our main perspective is to federate a community of users and practitioners to better design interactive environments and understand users behaviors.