I've just read about a wonderful idea in Maryland whereby folks sign up to share space in their backyards to a type of community supported agriculture, a kind of a distributed grid of food. The article by Greg Plotkin is over on Sustainable Food,
"The Murray Hill Row-by-Row Project has no farm; instead, it uses the member’s yards as the farming space, hence the term "lawnshare." Each member grows one or two crops in their yard, and what grows is shared with all the members. I organize who grows what, grow the seedlings, help members prepare their garden plot, help the members plant the seeds or seedlings, look over the crops and organize the harvest, which includes picking, dividing and distributing.
The members themselves give up lawn space and commit to daily watering and keeping an eye on the plants. Members find it a lot easier to grow a lot of one crop, rather than have a full kitchen garden of their own. From the relative ease of growing one crop and the small weekly fee, members enjoy a full variety of vegetables and a more developed sense of community."