Not sure if this website has been mentioned anywhere on Cyburbia..but I thought it would be useful to some folks in analyzing large city density, etc...
PS: if you have any questions of any of the places - I have been to many of them.
I have spent at least several days+ in at least 35 of the top 50 cities.
Sao Paulo and Mexico City only from a window - quite enough frankly
Have not been to:
Seoul, Istanbul, Guangzhou, Moscow, Dallas, Caracas, Dalian, Gold Coast City, Miami, Calagary, Recife, Benidorm, Panama City