Grids are a crucial enabling technology for scientific and industrial development. Peer-to Peer Computing, Grid, storage technologies, emerging web technologies, and other types of networked distributed computing, have provided new paradigms exploiting distributed resources. Grids are revolutionizing computing as profoundly as e-mail. This book is the fifth volume of the CoreGRID series. Organized jointly with the Euro-Par 2007 conference, The CoreGRID Symposium intends to become the premiere European event on Grid Computing. The aim of this symposium is to strengthen and advance scientific and technological excellence in the area of Grid and Peer-to-Peer Computing by bringing together distinguished leaders in research and industry within Grid Computing from the global community. The book is designed for a professional audience composed of researchers and practitioners in industry. This volume is also suitable for advanced-level students in computer science.