Grounding the analysis on multidisciplinary literature on the topic, the existing EU legislation and relevant examples, this working paper aims at highlighting some key economic and organizational aspects of the 'Open Government Data' paradigm and its drivers and implications within and outside Public Administrations. The discussion intends to adopt an 'Internet Science' perspective, taking into account as enabling factors the digital environment itself, as well as specific models and tools. More 'traditional' and mature markets grounded on Public Sector Information are also considered, in order to indirectly detect the main differences with respect to the aforementioned paradigm.