Hi matthodan, I'm building Pretty Graph (http://prettygraph.com http://prettygraph.com), which is more of a complete web-based data visualisation app, not just

Hi matthodan, I'm building Pretty Graph (http://prettygraph.com http://prettygraph.com), which is more of a complete web-based data visualisation app, not just a charting library. But we are also building an API, which might be of use to you. We also offer PDF downloads of graphs. Drop me an email (see profile) if you're interested.