Here's one, which we borrowed from urban gardening: the humble potato barrel. The concept is simple: plant potato seeds* at the bottom of a barrel. As the plants grow, add soil or compost. When the growing season is done, upend or break open the barrel then pick out the spuds from the results.
We piloted this last year with a couple of plastic barrels, and things went well. The plants grew rapidly, and escaped any touches of disease our other crops experienced. The end result was a nice pile of tubers.
So this year we expanded the potato barrel project, using every available container:
Five are standing, while one lays sideways, as you can see. I (Bryan) hauled the barrels together, then Ceredwyn started the seeds:
So far they're coming along nicely.
*potato seeds are actually chunks of potatoes. They need at least one eye to work.