The proceedings contain 67 papers. The topics discussed include: everyday favors: a case study of a local online gift exchange system; Televiewpointer: an integrated workspace awareness widget for real-time collaborative 3D design systems; progressive scenarios: a rapid method for understanding user interpretations of technology; avatars meet meetings: design issues in integrating avatars in distributed corporate meetings; dealing with wandering: a case study on caregivers' attitudes towards privacy and autonomy when reflecting the use of LBS; shared identity helps partially distributed teams, but distance still matters; network analysis of trace data for the support of group work: activity patterns in a completely online course; an algorithm for selective undo of any operation in collaborative applications; negotiating with angry mastodons: the wikipedia policy environment as genre ecology; and searching for reputable source code on the web.