Looking back one, two and five years ago today (give or take!) on Worldchanging:

2009
New Resource: The Living Planet City
Christa Morris reports on a new website from WWF Canada called the Living Planet City and questions whether it goes far enough in re-imagining our urban way of life...

2009
Citizens' Assemblies: Wise Democracy from the Minipublic
Jason Diceman examines Canada's practice of citizen assemblies as an outstanding example of wise and practical democracy...

2005
Dencity and the Augmented Environment
Jamais Cascio explores mega-tagging tools like denCity and Yellow Arrow as part of his ongoing examination of the Participatory Panopticon...

Other recent "look backs":
September 1
September 2
September 3