Scott McCloud's latest is all about story-telling secrets and how to shape your own vision for comics. It mimics the style of his earlier book, Understanding Comics, using the form to explain itself, and expands a bit more on the theories he presented there. I think it's wonderful to see how much more mature McCloud's own work is in this book. The art is better; the layouts are cleaner and more interesting. The visuals are all just more inventive and lively. I was glad that McCloud seemed to stretch himself and take the opportunity to demonstrate his competence by illustrating in a lot of different styles--you can tell that he really put a lot of work into these panels. All that effort pays off, especially in the chapters devoted to backgrounds and to facial expressions.
One of my complaints about UC was that he didn't give enough examples--but Making Comics absolutely makes up for that. To boot, there's an excellent bibliography, and every chapter has some supplementary wrap-up content. Each chapter ends with a couple pages of footnotes, commentary, and also exercises to help you flex your comics skillz. Very impressive, and a lot of fun to read.