I /still/ hate having to sign in twice in order to post. Grrrr.
Anyway, see this: http://vis.stanford.edu/protovis/
Slide mouse horizontally over this chart: http://vis.stanford.edu/protovis/ex/index-chart.html
However, let's not develop oodles on incomplete Perl interfaces, p-l-e-a-s-e. After all, we don't want another SVG debacle, do we?