Farming in new places

There have been some fantastic articles and features on farming in the last few days, including innovative vertical farming (Huffington Post) and freeway farming (TreeHugger). It's an excellent way to make room for the space we do have in urban environments, prevent erosion and preserve land that would otherwise be taken over by development.
It may not be what we are accustomed to when we think of sustainable farming, but any way to make farming more visible and accessible is a step in the right direction.