Skyscrapers

the proposed Chicago Spire (graphic from the Chicago Tribune)

On the heels of a redesign to the proposed Chicago Spire (I prefer the original), it is worth looking at the state of the world's skyscrapers.
As luck would have it, Wired has done a great job of running it down for us:

The world's cities are getting taller – and fast. Between 2001 and 2012, almost as many skyscrapers will be constructed as were built in the entire 20th century. While vertical metropolises like Hong Kong and New York continue to mint monoliths, the most dramatic changes are happening in lower-profile places. Thanks to globalization and the steady migration of people to urban cores, cities that once had only a few high-rises are morphing into mini-Manhattans. Miami, for example, had only five skyscrapers (buildings more than 150 meters, or 492 feet, tall) in 1999 but will have 71 by 2012. Dubai, in the United Arab Emirates, will soar from two in 1999 to 90 by 2012. Here's a snapshot of the world's fastest-changing skylines...

Be sure to check out the pictures showing what will be a progression of world's tallest buildings until 2012.