All workshops will be held on June 3rd.They will offer a terrific opportunity to meet in the context of focused and interactive discussions, to investigate emerging topics, to move new fields forward and build communities. Persons interested in participating to a workshop can submit a position paper to the organizers of that workshop (submission deadline: April 8), but workshop participation will be open to any IDC 2009 participant, upon place availability. Please notice that all attendants must register for both the workshop and the IDC conference itself. A selection of the best position papers will appear in the conference proceedings and in the ACM Digital Library.