I really love any ted talk on cities. Here are a few of my top picks.

http://www.ted.com/talks/aziza_chaouni_how_i_brought_a_river...

http://www.ted.com/talks/james_howard_kunstler_dissects_subu...

http://www.ted.com/talks/dan_barasch_a_park_underneath_the_h...

http://www.ted.com/talks/edi_rama_take_back_your_city_with_p...

http://www.ted.com/talks/jeff_speck_the_walkable_city

A few others that I can't really find right now, Creating Forrests in Cities, and Unique City building design

Edit for readablility