I've got a fairly complete one: http://github.com/Kilian/ico http://github.com/Kilian/ico It uses Raphael and Prototype, and has some interesting options that

I've got a fairly complete one: http://github.com/Kilian/ico http://github.com/Kilian/ico It uses Raphael and Prototype, and has some interesting options that most other libraries don't have (such as stacked area charts)