Typotheque: A typeface in four dimensions
beautiful font, fun visualization
ISBN Visualization
very cool visualization/exploratory interface for isbn-space
An intro to designing accessible data visualizations by Sarah L. Fossheim
practical, straightforward advice
Complexity Explorables | Complexity Explorables
"A collection of interactive explorable explanations of complex systems in biology, physics, mathematics, social sciences, epidemiology, ecology and other fields...." lots of ideas here