Burj Khalifa, new record-holder for world's tallest building, opens today, January 4, 2009, in United Arab Emirates. Apparently there has been a name switch from the previous "Burj Dubai."
I imported a model of a previous record holder, The Empire State Building (by Google), into a model of Burj Dubai/Khalifa (by Fadlulloh) for comparison. It's quite a large building.
Read more about it HERE.
I've added the model seen above (by Athinaios) to these 3D model collections: Tallest Freestanding Structures in History, 2010s