Google's newly released chart API generates charts and graphs on the fly called by a URL with the right parameters set. The Google Blogoscoped weblog runs down what data to hand the API to get back a pie chart, line chart, bar graph and more. Don't hot-link the image on your high traffic web site, though, you only get 50,000 hits on it. Here's the live demo if you want to play with it and modify for your own purposes.
Google Releases Chart Image Generator [Google Blogoscoped]
Google Chart API
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