One of the more interesting methods of gardening that people are trying is the food forest, where they convert a yard into a low-maintenance garden that doesn't really look like one.
A lot of urban gardeners point out that the "Back to Eden" / "Food Forest" options are not going to give optimal yields on smaller parcels of land, and certainly are not ideal if you're doing an urban or suburban garden as a commercial venture.
• Does The BACK TO EDEN Method Actually WORK!? (YouTube / The Gardening Channel With James Prigioni)