CollaborateCom is an annual international forum for dissemination of original ideas and research results in collaborative computing networks, systems, and applications. A major goal and feature of CollaborateCom is to bring the researchers from networking, systems, CSCW, and collaborative learning, and collaborative education areas together. CollaborateCom 2009 in Washington D.C., is the fifth conference of the series and it reflects the accelerated growth of collaborative computing, both as research and application areas.