I don’t know who’s going to occupy all these very tall buildings that are being constructed in Dubai.  Maybe the plan is just to build them and then have residents of other previously-tallest buildings in Dubai move to the now-current tallest ones.  They can use the older buildings then to house all of the workers they import from other countries to build all of this.

The current tallest building in the world, due to be finished in 2009, is the Burj Dubai, which is 818 meters.  The 1KM-tall building, the Al Burj, will be completed in 2020, and will then be the world’s tallest building, assuming Donald Trump can’t come up with something in the meantime (after all, if he can keep his hairpiece from blowing away, he can certainly figure  out how to build a very tall building that doesn’t suffer from wind shear).

You can read more here.[1] http://www.burjdubaiskyscraper.com/