Edward Tufte has a lot of interesting things to say about charts and data, more than i ever thought possible.

This infographic article seems to borrow some of his ideas without even mentioning him.

I would suggest folks read tufte's "the cognitive style of powerpoint." Lots of similar concepts in a short pamphlet.

http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0...

http://www.edwardtufte.com/tufte/powerpoint