This story in today's NY Times about buildings as vertical farms is so great. Sky scrapers would rely solely on renewable energy like solar and wind, and could provide sustenance for thousands of people. Wall-e would be heartened, I'm sure, to imagine a city built of edible plants, instead of garbage. Take that, New Museum 'After Nature' exhibition. This seems like the ultimate manifestation of urban gardening - imagine reaching out the window of your office cubicle and plucking a fresh cucumber for lunch.
On a similar note, I'm looking forward to heading over to PS 1 to check out PF 1 (public farm 1), an urban farm concept, complete with a chicken coop, that evokes the look of "a flying carpet landing in the PS 1 courtyard." PF 1 was the Young Architect Project's winning project this year, and is the design concept of husband and wife team WORK architecture.