If you have any interest on saving seeds for next year. This is the book! Not only tells you how to do it, but also has comintary from a master gardener from each region on the growing of the particular food.
Holly L. (irunamuk) reviewed Seed to Seed: Seed Saving and Growing Techniques for Vegetable Gardeners on
It gives a lot of info on the different families of plants, and how to preserve purity of lines, hand-pollenation, etc, but you'd better have at least a bachelors in botany if you plan on keeping up with this book. The New Seed-Starters Handbook by Nancy Bubel is much more practical for me.