That revolving tower
Many of you will have read the story of plans to build a revolving tower in Dubai. This isn't the first such announcement of a revolving building of some sort in Dubai, and there's yet to be one. I don't know if this one is any more likely, but the video is pretty cool.
Perhaps of even greater interest from an economic standpoint is the prefabrication construction technique envisioned by Dynamic Architecture.
Addendum: The divine nzm has a devastating comment over at UAE community blog. See especially the Chicago Tribune article about the architect that she points to.