Sizing Up a Megacity: Shanghai

Lagos: Ultimate Megacity

Megacities Initiative

National Geographic

Scientific American: Eco-Cities

 Suzhou Creek Redevelopment Project

Dhaka: Fastest Growing Megacity in the World (Global Post Sept 2010)

The World' Biggest Cities

Aerial Views

Megacities (National Geographic Magazine )

Megacities of the World: Visit the Most Populated Cities on Earth Info on Each of the World's Megacities

Megacities: What does the future of the world look like?
From ChannelOne.com, this site contains maps, statistics and photos from the world's largest cities.  

Global Trends: Megacities
This site has a lot of useful sections: definitions, global trends, main issues, and a general introduction to problems of mega cities.  

Mexico City -- A Megacity with Problems

Urban Air Pollution in Mexico City
A Case Study Report.

Mexico: Environmental Issues

Mexico City: A megacity with BIG problems

National Intelligence Council

The Origin and Growth of Cities ppt

SimCity Forum

YouTube - How to make a mega city in sim city 4

Mega Slums

More than 1 billion people call urban slums their home

BMW Megacity Vehicle (nytimes)

Special City Web Sites

Cities of the Future

City Web Cams

Urban Growth Graphics