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
I'm on the ZingChart team - we render charts in both HTML5 and Flash. So far we've gotten great feedback. Our charts are JSON driven and can plot huge data quickly [demo] http://www.zingchart.com/labs/blog_charts/10k_points.html.
transparency: I'm on the team. abegin[at]zingchart.com ^Andrew