A little background, for those who don't know. During World War II, families were encouraged to plant "victory gardens" under the idea that, if a family produced part of their own food needs, more energy and money could be devoted to the war effort. While the need for victory gardens is slightly different in this day and age, I believe the concept is one that is much needed, both to improve the quality of our food and to increase the sense of community in many towns and cities across the nation.
Gardens do not have to take up a large amount of space; hydroponics, greenhouses, and limited space gardening options are there for those who wish to research the possibilities (a good recommendation: "Square Foot Gardening", by Mel Bartholomew, which lays the garden space out in square foot sections and teaches interplanting and rotation techniques that can maximize the yield in a remarkably small area). Several well tended gardens in inner city neighborhoods would increase the air quality, and, if properly maintained, the aesthetic appeal of once blighted communities, as well as educating inner city children, many of whom are largely unaware of how plants are produced.
Sure, not everyone has the opportunity to set up a complete homestead. But a return to the concept of a "victory garden" can help reduce food costs and increase interaction between individuals in areas where the idea is greatly needed.