An interesting beginning for a potentially valuable and interesting tool....

"Javascript Infoviz Toolkit -- Treemaps, Radial Layouts, HyperTrees/Graphs, SpaceTree-like Layouts, and more.in this Javascript suite for building data pretties. Higher-level than processing.js. (via O'Reilly Radar and chrisblizzard on Twitter)

Features
  • Multiple Data Representations
    Treemaps, Radial Layouts, HyperTrees/Graphs, SpaceTree-like Layouts, and more...
  • Major Browsers Support
    IE6+, Firefox2+, Safari3+, Opera9.5+
  • Open Source
    Licensed under the BSD License
  • Library Agnostic
    You may use the JIT with your favorite DOM manipulation framework
  • Extensible
    All visualization classes are mutable, so you can easily add/override any method you want.
  • Composable
    Visualizations can be combined in order to create new visualization methods."