This site has a nice article, complete with pics, on making a raised bed garden and then turning it into a greenhouse using an old lawn umbrella frame and plastic. Combine with Square Foot Gardening planting and this seems like it should give pretty darn good production. Raised Bed Gardening From Recycled Materials Kajun
There are also lots of gardening .pdf's located in the SM downloads section I recently added. More to come, too.