Have been wanting to investigate a decent charting component (for both Web and Swing use) for a while, but haven’t had the time. Did a bit of surfing, and I’ve just come across jFreeChart (http://www.jfree.org/jfreechart/) which looks just sensational.
Tried out the demo app that ships with the product and it does a truly amazing number of charts, in a very tight amount of code. The dynamic charting stuff looks truly funky. Can’t wait to take it for a test drive.