Abstract. Community poster boards serve an important community building function. Posted fliers advertise services, events and people's interests, and invite community members to communicate, participate, interact and transact. In this paper we describe the design, development and deployment of several large screen, digital community poster boards, the Plasma Posters, within our organization. We present our motivation, two fieldwork studies of online and offline information sharing, and design guidelines derived from our observations. After introducing the Plasma Posters and the underlying information storage and distribution infrastructure, we illustrate their use and value within our organization, summarizing findings from qualitative and quantitative evaluations. We conclude by elaborating socio-technical challenges we have faced in our design and deployment process.

Plasma Posters are large screen, digital, interactive posterboards situated in public spaces, designed to facilitate informal content sharing within teams, groups, organizations and communities. While interest in interactive community poster boards has grown recently, few successful examples have been reported. In this paper we describe an ongoing installation of Plasma Posters within our organization, and report qualitative and quantitative data from 20 months of use showing the Posters have become an integral part of information sharing, complementing email and Web-based sharing. Success factors include our design process, the reliability and flexibility of the technology and the social setting of our organization. We briefly describe three external installations of the Plasma Poster Network in public places. We then reflect on content posting as "information staging" and the ways in which the public space itself becomes part of the "interface" to content.

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Collaborative note taking enables students in a class to take notes on their PDAs and share them with their "study group" in real-time. Students receive instructor's slides on their PDAs as the instructor displays them. As the individual members of the group take notes pertaining to the slide being presented, their notes are automatically sent to all members of the group. In addition, to reduce their typing, students can use text they receive from other students and from the instructors slides to construct their notes. This system has been used in actual practice for a graduate level course on wireless mobile computing.