Robin Good: Here is a curated collection of "libraries for plotting data on maps, frameworks for creating charts, graphs and diagrams and tools to simplify the handling of data" to create interactive and dynamic data visualizations.
Useful. 8/10
Collection: http://datavisualization.ch/tools/selected-tools/
[Serious bloggers and content producers will find these resources to be invaluable - JD]
Via Robin Good
What an interesting selection of tools for data presentation, if only more of them were free.