This is an open source thing written in JavaScript with SVG. It runs well in IE/ASV, Chrome, Firefox, Opera, Safari. We described the thing at SVG Open (but it was in the "small room" so some of you missed it.
http://www.svgopen.org/2009/papers/42-Grapher__an_open_source_SVGbased_w...

At Jeff Schiller's encouragement, we will work on moving it to a Google Code Project.

For now take a look at http://granite.sru.edu/dailey09/grapher.html (there is an old VML version for IE only at llinks visible from http://srufaculty.sru.edu/david.dailey/grapher/)