I've been following this thread and an very impressed with all the ideas.
I'm an appraiser and I just finished appraising the most impressive semi-self-sufficient small property I've ever seen. This was a single older woman with maybe 1/3 of an acre town sized lot. Every inch was used. The entire back yard was fruit trees and garden beds with paths in between. She had a small chicken house and 4 hens in a medium small run. She had a small pond (maybe 8x8) with freshwater prawns (shrimp). She says buys them wiggler sized in the spring, lets them grow all summer and nets them out every fall before it gets cold and gets a few dozen pounds. She has a beehive too. She showed me her variation on raised beds; she takes a piece of 4 ft high wire fencing and makes a 2-3 foot wide circle and secures it with wire twist ties. She fills it with straw from the chicken house, grass clippings, raked leaves, etc and plants in the sides right through the wire. She had potatoes in the middle growing out the top and tomatoes hanging down the sides. She has raspberry and blackberry bushes on her fenceline, small fig bushes/trees up against the back wall of the garage, Absolutely no grass to cut in the backyard. Every inch used. It gave me a lot to think about.