An anonymous reader writes:
Taking advantage of the vector graphics features offered by the latest browsers, a recently created website called FooPlot turns your web browser into a function plotter (in 2-D and 3-D), offering a few basic graphing calculator features with a promise for further developments and integration with popular online spreadsheet applications. Gaining popularity in an educational context both in high schools and universities, this is another great example of the potential of the Internet to become the application platform of the future.
As an added extra, FooPlot also permits functions to be tacked onto the URL: http://fooplot.com/x^2+2x+1.