Check out this
post from Ajaxian:
"Dheera Venkatraman has released Fooplot,
a new website that plots any function, and supports Google Maps-style
Fooplot is currently using SVG and VML to do the rendering and canvas
support is coming for Safari.
For good SVG browsers like Firefox and Opera, 3D plots work too.
In the future, it will communicate with Google spreadsheets and
interact with server-side scripts that do curve fitting and other