On My Bookshelf
Seed to Seed: Seed Saving and Growing Techniques for Vegetable Gardeners by Suzanne Ashworth
Someone recommended this excellent book to me and it is totally chock full of information you need to get started with seed saving. I have to admit it is pretty overwhelming, when you start thinking about isolating various crops from cross-pollination (especially since many of our neighbors have vegetable gardens) and all the different techniques you need for different vegetables. I got the book out from the library, but I can already tell I'll need to buy it to use as a more or less constant reference. I'm saving seeds this year from a few easy plants - melons, pumpkins, edameme, and I'll try the harder stuff as we go.