I just read presentationzen by Garr Reynolds. It is a quick read with terrific graphics. I think the book is mostly targeted to business people who have no graphic or instructional design background, but it has valuable information for people who design training materials every day.

I have been working on developing an E-Learning Strategy and ran across a great diagram for the E-Learning value chain on the web.  I traced it back to a free Ebook called Theory and Practice of Online Learning from Athabasca University.  The first edition of this book does a great job of describing the value chain in Chapter 3:  Value Chain Analysis: A Strategic Approach to Online