What Jaime Lerner and co. have done with Curitiba, Brazil -- completely overhauled a growing city with escalating problems into one of the "most livable" places around, with the most efficient bus system in the world. They're all about what works very quickly for very little money.
http://en.wikipedia.org/wiki/Jaime_Lerner
http://en.wikipedia.org/wiki/Curitiba
http://en.wikipedia.org/wiki/Rede_Integrada_de_Transporte
http://www.commondreams.org/views05/1108-33.htm
http://www.ted.com/index.php/talks/jaime_lerner_sings_of_the_city.html
http://www.globalideasbank.org/site/bank/idea.php?ideaId=2236
http://findarticles.com/p/articles/mi_m1510/is_/ai_16816236
http://www.urbanhabitat.org/node/344
http://www.guardian.co.uk/society/2008/mar/26/communities.regeneration
http://transcripts.cnn.com/TRANSCRIPTS/0012/24/se.01.html