What are the best free and pay web charting libraries?
yish: Protovis out of stanford (http://vis.stanford.edu/protovis/) seems to be incredibly comprehensive while also being really slick and interactive.  Haven't had the chance to use it on a project but have it bookmarked since it would be the first thing I would try when I do.  Also, seems to be updated regularly. I know they didn't support IE for a long time as they are SVG based, but not sure if that has changed.