http://pps.org

''From the site ...''

PPS is a non-profit organization that for 25 years has successfully carried out its mission statement to build communities by creating the special places that build community life. PPS has brought its technical assistance, research and educational efforts to over 1000 communities, throughout the United States as well as abroad, to improve the comfort, attractiveness, social and economic use and vitality of their public spaces.

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See http://c2.com/doc/space.html -- Wiki as Public Space