This answer could go on for pages and pages, but in short, I would recommend old-fashioned books. Websites that deal with organic gardening still aren't well organized. There are is also much great a wealth of information that isn't about Organic Gardening per se, such as Permaculture books. I like:
- The New Organic Grower (or anything by Eliot Coleman)
- Perennial Vegetables by Eric Toensmeier (he has a new book coming out next month, too)
- Roots Demystified by Robert Kourik
- Gaia's Garden by Toby Hemenway
- Many old Rodale standbys, such as their books on Organic Gardening, Compost, Natural Pest Control, etc
If you need internet help, the forums at GardenWeb are the best.