Gaia's Garden, Second Edition: A Guide To Home-Scale Permaculture
This is a really fabulous book. I recommend it highly for any permie.
Permaculture: Principles and Pathways Beyond Sustainability by David Holmgren
Another splendid book. This is an updated look at Permaculture from one of it's original authors. No permie library is complete without it. David Holmgren makes Permaculture more accessible to everyone.
Edible and Useful Plants of Texas and the Southwest A Practical Guide
A real gold mine for low or no care local food plants. Lots of the plants that have been mentioned on austinperm appear in the book, as well as a bunch of southwestern natives that people have been looking at in a new light--esp. the yuccas and agaves.
Check it out..
There is a version online at google preview (http://books.google.com/books/utexaspress?id=pnnHgcasN-cC&printsec=front...)