If you haven’t read Scott McLoud’s Understanding Comics you should. This guy is really a master of his craft. If you are a graphic designer, artist, or do any kind of visual expression this book will really expand your understanding of visual communication. Reading it put a lot of things into a new perspective for me.
I found a Ted Talk video, it doesn’t do his books justice, but it does give you a glimpse into his mind:
Wow he looks totally different in real life than his comic alter ego! (I guess the checkered shirt is the same.)