NCA 2007 covers research from a variety of areas in networking and networked systems, from protocol development to application tuning. The proceedings broad focus provides a cross fertilization between the many strands of network computing research. The papers explores current and future trends among researchers from industry and academic institutions on ways to improve the technology. It focuses on fundamental research and practical experience reports.Contents: Internet Traffic; Distributed Storage; Publish/Subscribe and Peer-to-Peer; Security; Fault Tolerance; Performance; Adaptive and Dynamic Networks; Trusthworthy Network Computing Workshop