This is a MUST READ for anyone growing tomatoes. There's LOTS of science behind this planting plan that makes super healthy plants. Links give even more advice/ with pictures. remember to read this before planting.
This is called "Foodscaping" Geneva, Switzerland. Each yard is a vegetable garden and neighbors consult and plan what each will grow so they can trade. Imagine if we did this everywhere? via SEED: The Untold Story & Spiritual Ecology