THE definitive resource for Disney restaurants. Focused specifically on dining, this e-book covers the restaurants, dining plans, and strategies with lists, tips, and tricks. Each year, it's updated with the latest changes—highlighted for those already familiar with Disney restaurants.
If you haven't been to Disney World yet (or it's been a while) it's worth spending a little time getting up to speed. These resources do a good job filling in the gaps as well as providing some tips and tricks to make your trip extra special.
A great all-around planning book with lots of information about dining at Disney World. Buying the book also gives you a discount to the excellent TouringPlans site.
Another great all-around book, similar to The Unofficial Guide, but a slightly easier read that doesn't go quite as in-depth.
Part of the fun of a Disney trip is trying to reign in all the things you could possibly do into a smaller list of the things you really want to do. These resources exist to make that process fun, easy, and rewarding.
Blog
An incredible amount of content geared specifically toward trip planning. Check out their planning process to add some structure to your plan.
Software/Blog
While the site has great content, the tools it provides are a highlight. Their planning tool lets you schedule entire days, including what FastPasses you'll use, how long it takes to walk between attractions, and booking time for lunch.
One of the best ways to learn about whether you would like a restaurant is to read reviews of others that have visited. Many of these sites provide photos, videos, and detailed descriptions of what the visit is like and beautiful images of the food.
Because Disney provides commissions for travel agents, these services are almost always free and can be a huge help.
Agency
One of the earlier agencies, run by the folks that run The DIS and the DIS Unplugged podcast.