RGraph in <canvas> HTML 5

'RGraph' A canvas graph library based on the HTML5 canvas tag.

1. Graphs are created at client side, server need not send any image (you simply send the Javascript libraries once)
2. Graphs will be rendered/ displayed faster
3. Graphs can be seen offline if saved as HTML page

http://www.phpguru.org/static/canvas.html
http://www.rgraph.net