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RaphaelJS offers the advantages of SVG with an IE fallback. It's a Javascript library that outputs VML in IE6+ and SVG everywhere else.

The graphs can be manipulated in JS after their creation to create animations.

http://raphaeljs.com/

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Also has the disadvantage of adding a lot of unnecessary overhead to SVG, changing how you interact with it, and preventing you from using lots of SVG features. For anything that needs much redrawing or interaction, the IE fallback can be extremely slow.

If you have reasonably simple needs or can adapt an existing Raphael demo, go for it. For my own projects, I don’t think it’s worth it, but YMMV.

Protovis is a much more exciting SVG framework.

I favor Protovis (quick) and jquery.svg (custom).

The library they're using, b3, was developed by some of the same folks as Protovis. Protovis looks interesting, thanks for the link.

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