http://www.willarson.com/code/sparklines/sparklines.html
This library seems more feature-full. It works in Safari.
Actually, it works in Opera, Safari, Firefox and in Internet Explorer (using the excanvas). Its still evolving a bit, and I hope to add more statistical analysis to it, but its a bit fun.
It doesn't seem to work in Safari 2 though. Looks fine in FF2.