Darth Vader: A 3-D Reconstruction Log. The book takes the form of notes from two robots working on the operation to re-build Anakin Skywalker after his battle with Obi-Wan Kenobi. Each page covers a specific aspect of Darth Vader's technology and components, from his breathing mask to his skeleton to his cape. The coolest part is the centerpiece of each page, a cross-section of Darth Vader that peels away in layers as you read.
Here's the trailer for the book, which also shows some of the pages:
You can get Darth Vader: A 3-D Reconstruction Log at Amazon.com.