d3.js, which was used for this is pretty sweet. If you haven't checked it out, take a peak at the github repo. http://mbostock.github.com/d3/ http://mbostock.g

d3.js, which was used for this is pretty sweet. If you haven't checked it out, take a peak at the github repo. http://mbostock.github.com/d3/ http://mbostock.github.com/d3/