The Burj Dubai. Construction began in 2005 and is expected to be complete by 2008. At an estimated height of over 800 meters, it will easily be world's tallest building when finished. It will be almost 40% taller than the the current tallest building, the Taipei 101. 
This is what downtown Dubai will look like around 2008-2009. More than 140 stories of the Burj Dubai have already been completed. It is already the worlds tallest man made structure and it is still not scheduled to be completed for at least another year.
