In case you missed it, here is an amazing image of India from space at night.
NASA Earth Observatory site. The image shows the density of population there. The lights of more than 1.2 billion people are represented here. India has 30 cities with populations over 1 million - imagine how much energy could be conserved if the lights were retrofitted so as to not shine wastefully upward into space.
By the way cities in Bangladesh, Nepal, and Pakistan
are also visible near the edges of the image.
There are several high-resolution download options on the NASA site that are worth checking out, including a Google Earth KML file.