Growing Sunchokes (aka Jerusalem Artichokes)
One of the plants I want to try is Sunchokes, aka Jerusalem Artichokes. They are a hardy plant, with a tasty tuber. They grow tall like a sunflower and do well in poor soil. You can also use the tubers to make a liquor, which is pretty cool.
They are also as invasive as bamboo, so be careful how you grow them. This article from Practical Self Reliance has some hints. I like the idea of growing them in trash cans. I've got some space near a fence where they could be put and might do well.