Here is a detailed and useful post from Sharon Astyk with some good basic info about seed-saving. Here is her advice about where we might think about getting seeds here in the PNW:

For the Pacific Northwest, the obvious leader is Territorial Seeds  I like them, and I’ve had good results using varieties adapted to their region in the Northeast.  I will say that I’ve had difficulty getting good information from their customer service over the years – they have declined to reveal the source of seeds, are sometimes slow to send things out,  and when they listed two varieties I had seen elsewhere as hybrids as open-pollinated, I was pleased to think that someone had stabilized them, and then  called and was reassured that yes, they definitely were open-pollinated varieties.  Well, oops, no they weren’t.  Their prices are also high – too high to give mediocre customer service.  But they do provide an important service in their region, and offer some varieties you won’t find anywhere else.

Other Northwestern options are a tiny company I’ve ordered from and liked and the wonderful Northern CA Bountiful Gardens Catalog. Bountiful Gardens is a terrific small seed company that is run in part by John Jeavons, the person who has most devoted himself to figuring out how to feed the world in small spaces. Not only do they have great seed, but they are a great cause. They also have a remarkable variety of compost, fiber and other uncommon crops. For those of you in northern CA and the Pacific NW, this is probably the place to buy, but all of us can get some wonderful things from them.

She also links to another one of her posts about designing a seed-saving garden, in which she mentions the book by Carol Deppe that Kevin got a hold of:

The two most useful books for seed savers past the very beginning stage are Suzanne Ashworth’s Seed to Seed and Carol Deppe’s Breed Your Own Vegetable Varieties — I strongly recommend that these be part of every gardener’s library. The second one may sound intimidating, but even if you have no intention of breeding, it is full of fascinating and useful information about plant genetics, presented in an accessible and fun to read (I know that sounds nuts, but it really is) way.  The reality is that seed saving is plant breeding – each subsequent generation becomes better adapted to your region and its conditions.