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I've worked with gRaphael. it's still immature, and the code base is still immature. I'd look at protovis before taking a look at gRaphael.

However, I do wish that protovis is based on Raphael and jQuery.

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define immature

you couldn't put y-axis tick mark labels on bar graphs, to start.

I'd second this. We've been using GRaphael for the reporting graphs on MinuteDock, and we had to manually hack in a bunch of things - like rotating the labels on the x-axis correctly if they were too long, and even drawing both axes on some graph types.

It's worth the effort though - works on iPhone/iPad out of the box, and is super snappy even on OS X (unlike most Flash charting solutions, including Google Viz.)

Looks like the documentation is still in progress: http://g.raphaeljs.com/reference.html

but the demos are pretty impressive.

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