Just got The Art of DK III hardcover and I'm very, very pleased.
It's got pretty much all the variants as far as I know. It has ALL the Frank Miller and Jim lee variants in full color, as well as some pencil drawings as well. And alllll the other covers, including my other favorite Bill Sienkiewicz.
There's no text. Just art. If that seems like a rip off, maybe it's not for you, but I think it's a steal especially if you grab it on amazon for less than $20.
Only two criticisms: The two page spreads bleed into the binding like any other hardcover, and unfortunately those are some of the best images from Lee and Miller.
The other big drawback? No covers from The Last Crusade. That was a sucky book but the Miller cover for that was awesome. I'm let down it isn't in here.
Also, a "new" piece I had no idea existed! A convention only cover for issue 9 by Miller!! So if you really were collecting all the Miller covers, good luck tracking that one down cause I bet it cost some serious coin.
Anyway, this book is a treasure trove of images by the top artists in comics doing homages to Dark Knight.....buy it!!