I love this thread! Could everyone please give original links so we can read more about them. I want to know more about the tin can garden. I've tried that and I find it hard to keep everything moist.
Here's the link, but it's not really informative: http://ewainthegarden.blogspot.com/2010/05/vegetable-garden-ideas.html
ETA: Ooops, beaten. Thanks Kitteh!