Let me preface this by saying that I have never shown a dog in conformation and I have only the vaguest notions about how you train a dog for it (I know a little
about gaiting because I trained Pongu on cavaletti for Rally and freestyle stuff, but it wasn't the same focus as conformation-style gaiting at all). And I have not actually read the book I'm about to recommend.
With that said, I've heard good things about this book as an introductory text for beginners: Welcome to Dogwise.com
-- I believe there's a DVD set that goes along with it, but I haven't heard much about that.
My understanding is that this book is written for people who are very
new to conformation showing, and that some of the information is likely to seem quite basic if you're already familiar with the training concepts. So maybe it's not what you're looking for, and someone who has more experience in this field might be able to give a more informed opinion. I'm mostly just throwing it out there because it's the only title that anyone's ever mentioned to me as a potential resource.
ARCHMX TDCH Pongu the Insane, CD-C, RE, RL1X6, RL2X5, RL3X2 (GSD mix, b. Apr 2010)
Crookytail the Tigerwuff, RL1, ITD (Akita mix, b. Jan 2011)