http://zingchart.com renders in HTML5 Canvas and/or SVG, so it will render on older Androids that don't have SVG support. Also VML for auto fallback to IE6 w/out need for ExCanvas.

transparency: I'm on the team. abegin[at]zingchart.com ^Andrew

this may be something you could use, http://www.highcharts.com/ I like it, it's cross browser compatible!

Cool, I'll check it out. Thanks for the Rx. Is it pretty quick to work with for you?

yup documentation is nice.. with clean javascript wrapper and highly customizable

i was hacking around under the covers of Mixpanel's 'Platform' a while back and if memory serves, they wrapped highcharts into their api for that product.

Go for Google charts, it's really awesome.

http://code.google.com/apis/chart/

I always felt there were lots of gymnastics required to get data into a suitable format for Google charts (filling zeroes in time series, tough to work with multiple series, etc)

There's also http://www.rgraph.net/