Does anyone have a garden to help lower food costs?

It may sound old fashioned, but I'm wondering how many have a garden, and if so what kind of foods do you grow. Florida is a lil hard to have a garden in, have to buy real dirt and all. But I've been successfull with zucchini, tomatoes, cucumbers, and green peppers. Nothing like walking into the backyard instead of the produce isle

This contraption looks pretty cool for gardening:
http://nga-gardenshop.stores.yahoo.net/13-1330.html

I saw it in action at WIRED magazine's NextFest.