Square Foot Gardening - Mel Bartholomew
http://amzn.to/lH66lNEasy and low-maintenance method. Very close plant spacing, raised beds.
Gardening When it Counts - Steve Solomon
http://amzn.to/jSIicaFocus on reliably growing food when you have no resources available, like water or fertilizer. Recommends wide plant spacing. How to make your own organic fertilizer and compost. Lots of insight about seed companies and where to buy seed from.
Grow more vegetables in less space than you thought possible... - John Jeavons
http://amzn.to/lCt4WSRecommends double digging each year. (I'm against this practice personally)
Gaia's Garden - Toby Hemenway
http://amzn.to/jQ5G7FPermaculture methods for city dwellers.
