Comment on: Win an iPod touch: Have your say on the Isover Architectural Design Competition shortlist
I do prefer The Green Ramp.
Roof and outside walls of the Ramp can also serve as advertising surface side-by-side, adding to financial viability of the project.
It exploits vertical space in an environmentally friendly way while creating a beautiful city scape and commercial opportunities. Very much in-sync with Jeb Brugmann's idea of a global Citysystem, put forward in his book Welcome to the Urban Revolution.