Here's why Raphael.js and SVG totally rock.
There's also gRaphael specifically for charting:  <a href="http://g.raphaeljs.com/" rel="nofollow">http://g.raphaeljs.com/</a><p>Also, the article mentions that IE doesn't support the <canvas> tag.  While this is true, you only need to add the excanvas JS library to use <canvas> in IE.