We just received a submission from Grey Worldwide, New Delhi, India of a billboard that has already been making the adblog rounds. It advertises www.delhishomeless.org - a domain which currently contains a link farm but previously hosted the shelter rights campaign, a citizen's initiative to address the problems of the homeless in Delhi. The poster ran last year in the spring of 2006.
It reminds me just a tad of the 1995 Badlander 'parkbench media' in its thinking. The Crispin & Porter campaign used traditional media to show that the outdoors was someone elses home.