charting package

I'm looking for charting software to use in the java app I'm working on.

Does anyone have any experience or recommendations.

One of the packages I've looked at which looks interesting is jfreechart at jfree.org.

Some of the requirements are:
- open sourse
- available as a jar
- some support of html files (which will be needed as output at one point in the apps process). This is in addition to the regular jframe display

Thanks
Lou
.