This book constitutes the refereed proceedings of the 8th International Conference on Passive and Active Measurement, PAM 2007, held in Louvain-la-Neuve, Belgium, April 2007. Coverage focuses on research and practical applications of network measurement and analysis techniques, detailing interdomain routing, P2P, wireless 802.11, wireless 3G/CDMA/Bluetooth, infrastructure and services, traffic, and measurement principles.