Preface - Monica Colpi, Piergiorgio Casella, Vittorio Gorini, Ugo Moschella and Andrea Possenti\nBinary Systems as Test-beds of Gravity Theories - Thibault Damour\nExploiting Binary Pulsars as Laboratories of Gravity Theories - Michael Kramer\nPerspective in The Search for Relativistic Pulsars - Nichi D\'Amico and Marta Burgay\nThe Formation and Evolution of Relativistic Binaries - E.P.J. van den Heuvel\nDynamical Formation and Evolution of Neutron Star and Black Hole Binaries in Globular Clusters - Monica Colpi and Bernadetta Devecchi\nShort Gamma-Ray Bursts: Marking the Birth of Black Holes from Coalescing Compact Binaries - Davide Lazzati and Rosalba Perna\nStrong Gravitational Field Diagnostics in Binary Systems Containing a Compact Object - L. Stella\nWhite Dwarfs in Ultrashort Binary Systems - Gian Luca Israel and Simone Dall\'Osso\nBinary Black Hole Coalescence - Frans Pretorius