Steve Solomon: Growing Vegetables West of the Cascades, Sasquatch Books. Probably the best regional guide to growing vegetables.
Eliot Coleman: The New Organic Grower, Winter Gardening Handbook, and more. These are written for more of a small farm scale, but have lots of useful information and innovative techniques.
Grace Gershuny and Joseph Smilley: The Soul of Soil. Good primer on soil science and health.
Other authors: Carol Deppe, Michael Philips, John Jeavons, Joel Salatin. Acres USA is a great resource for finding and purchasing relevant books.
Wild Garden Seed: Frank Morton breeds excellent seed for salads and more out of his farm in Philomath
Adaptive Seeds: Sarah Kleeger and Andrew Still traveled to Europe to exchange and collect seeds, and founded a seed company with what they brought back. Specializing in unusual varieties and cold-tolerant vegetables.
Fedco: A seed cooperative in Maine with an entertaining catalog, diverse seed sourcing, and excellent prices
Johnny’s: Large seed company in Maine with excellent quality and selection and an incredibly informative catalog and website.
Dripworks has an informative catalog and website, lots of irrigation options, and also many garden planning tools.
Peaceful Valley Garden Supply has all the supplies you need to grow organically and lots of informative videos.
Naomi’s Organic Farm Supply in Portland has knowledgeable staff and a wide range of well-researched products.
Concentrates in Portland is similar to Naomi’s.
TCCA Farm Store in Cloverdale and Tillamook carries several organic amendments and is able to order many more.
ATTRA: provides information and other technical assistance to farmers, ranchers, Extension agents, educators, and others involved in sustainable agriculture in the United States.
Oregon Tilth has a long list of resources for organic farming and gardening at their website.
Mother Earth News has lots of good articles and resources.
Find a farm (directories and a couple of my favorites):
Local Harvest National directory of all things locavore: farms, markets, stores, processors, food advocacy groups, etc etc. A great resource for eaters and producers alike. We have a listing there, as do many of our friends.