d3 (data-driven documents) is a library for creating visualizations that is gaining momentum.
http://mbostock.github.com/d3/
This is a bit like jQuery, but instead of focusing on providing ready-made graphical widgets, it makes it much easier to create visualizations. However, this simplifies the creation of various diagrams and visualizations, and there are a number of examples, most of which have very little code.
Alan
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