Visualizing Networks: Beyond the Hairball by Lynn Cherny.
Impressive slide set on visualizing networks that concludes with a good set of additional resources.
The sort of slide set that makes you regret not seeing the presentation live.
Mentions J. Bertin’s Semiology of Graphics. It is back in print if you have a serious interests using graphics for communication.
I first saw this in a tweet by Peter Neubauer.