I too saw Tufte's presentation. I saw it a couple years back in Chicago. I particularly remember the discussion about the role that PowerPoint may have played in the Challenger Disaster. All very interesting stuff... I walk past the books I got at that presentation almost everyday, and always think to myself, "I need to read them." But, to date, I haven't.

The most interesting "graphic" I've seen recently was on ArcGIS Online. It was a map. There were two layers. One was the Marquette Interchange back in the 1970's and the other was the current interchange. The current map was the background, and you could change the transparency of the 1970's map to see how the interchange has changed over time. Very interesting to see how the interchange has expanded and the affect on surrounding neighborhoods.

The Marquette Interchange is a major interchange in the Milwaukee area. It was fairly recently rebuilt.