Jim Clark has put together a great little JFreeChart builder for Groovy called GroovyChart. I've been thinking for a while that I'd love to add some simple charting to GroovyBlogs, and I figure this was a great way to get into it. I've had a play, and could generate the demo charts just fine, but once I wanted to go a little deeper, I got a little lost in the builder semantics. It looks like it's going to be a great little library, though.