19.20.21 (19 cities in the world with 20 million people in the 21st century) is a nice site for an effort to undertake "a five-year study that will encompass all aspects of the phenomenon of supercities" but the real attraction are the maps of the world's largest cities through time (Menu/10 Largest Cities). In 1000, the largest city in the world was Cordova, Spain and by 1500, 4 of the top 10 were in China and one was in Nepal. (via snarkmarket)
...is a weblog about the liberal arts 2.0 edited by Jason Kottke since March 1998 (archives). You can read about me and kottke.org here. If you've got questions, concerns, or interesting links, send them along.