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 techlogical excellence in the area of Grid and Peer-to-Peer Computing. The book includes all aspects of Grid Computing including service infrastructure. It 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.