The "sqaure foot gardening" method is certainly a viable way to get some crops from a small area... it's essentially another variation of "raised bed" gardening, which can be done on any scale.
Because they can be "roomy" plants when thriving, Tomatoes seem to be missing from most square-foot plots. So, for me personally, that's one thing that I would try to find some separate space for. Search around the web, and you'll see lots of space saving options for growing tomatoes.
But, if you've got an acre lot to work with; finding an area for a few tomato plants will probably not be that difficult.
(of course, this is assuming that you like tomatoes)

Also, I would recommend 2 books to anyone interested in learning more about gardening ... "The Joy of Gardening", by Dick Raymond ... and "Burpee : The Complete Vegetable & Herb Gardener".
Those are both large books, think "garden bibles", with tons of useful information for gardeners, and gardens of any size.

Best of luck ... nothing tastes better than fresh veggies just-picked from your own garden!