IUTAM Symposium on Unsteady Separated Flows and their Control : Proceedings of the IUTAM Symposium “Unsteady Separated Flows and their Control“ Corfu Greece 18 22 June 2007 Unsteady separated flows are an important topic in theoretical and applied mechanics. The IUTAM Symposium held in Corfu in 2007 (and following on from a previous meeting in Toulouse in 2002) aimed at achieving a unified approach which will regroup the knowledge coming from theoretical experimental numerical simulation modeling and flow control aspects of separated unsteady flows with respect to incompressible and compressible flow regimes. Topics addressed include physical aspects of the dynamics related to unsteady separation in incompressible flows and flows under compressibility effects