I've used http://www.amcharts.com http://www.amcharts.com (and its mapping companion http://www.ammap.com http://www.ammap.com). It was originally in flash but

I've used http://www.amcharts.com http://www.amcharts.com (and its mapping companion http://www.ammap.com http://www.ammap.com). It was originally in flash but now there's also a js version (havent tried it yet). I think i've read here on HN that a new flot fork has been released with jquery requirements but i cant find the link