I'll have to look more into this library. I'm glad to see it uses SVG and VML (edit: oops - plus Canvas). That seems like the right fit for this problem, since

I'll have to look more into this library. I'm glad to see it uses SVG and VML (edit: oops - plus Canvas). That seems like the right fit for this problem, since SVG and VML have pretty close models and that way you can have native vector graphics in all browsers. Edit 2: I have a question. Are the charts on the Demo page drawing so slowly because of someone's clever idea of an animation? Or does the library actually draw that slowly?