Dhtmlx team is currently preparing a major upgrade of its Ajax UI toolkit, and as a part of this upgrade some new components will be made available. One of new products in dhtmlx line will be dhtmlxChart, a cross-browser charting library written in pure JavaScript. This is just a release candidate but you already may try the variety of features included in dhtmlxChart: rich customization capabilities, wide script API, line/bar/pie chart views, tooltips, Ajax support, etc. The component will be available under GNU GPL and commercial licenses (for those who want to use it in non-open source applications).

For the details you may check this article in dhtmlx blog:
http://www.dhtmlx.com/blog/?p=412

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