I had the wonderful opportunity to see Edward Tufte speak. I highly recommend anyone who is a designer, developer, business/product manager, education, information services, and/or IT to go his event. It is a one day course that costs $400, and you receive all 4 books.
He opens with this animation:
InfoViz that displays all these bits of information: past, future, present (in white), visual music interface, pure information/content.
Please feel free to download my notes, but you will need his books as a reference. Please excuse any grammatical errors since I was typing on my iPad:
Also, below the fold of his site http://www.edwardtufte.com/tufte/, there are a list of links to discussion topics: