SFG - square foot gardening, Mel Baretholemew.

It's about laying out the garden in a square foot grid, and planting a different plant in each square, with density in each box dependent on what plant it is. Also recommends a mix of vermiculite, compost and moss add the medium, with only six inches of depth necessary.

I've tried it out and it works very well, can be set at table height, and is very easy to work with (nice vertical gardening tips too). I prefer building my soil, and not relying on the inputs that would be necessary, but I use the grid for most of my plantings. Saves seeds, keeps the garden neat, and allows for intensive planting.