I read an article about Charter Cities lately and I'm facinated. I was thinking about something like that, but my ideas were not at all on the scale being considered. Econimist Paul Romner has really thought it through. The idea is that a first world country would lease land in a third world country and administer it. It is fairly radical, and of course politically incorrect, to suggest that anything other than infrastructure and geography is holding back the thirld world. But corruption, poor government, and poor policy making also plays a factor.
The classic example is Hong Kong which did much better than mainland China despite similar conditions.
I have been thinking that the transition in Cuba, when it does come, could be more successful if the government of Spain loaned the country a large number of civil servants. They are largely incorrubtable, well qualified, and Spanish society has experience with transition from a totalitarian dictatorship to a democracy.
More about Charter Cities at CharterCities.org