If you do any display of usability result online, try out the Google Charts open API at http://code.google.com/apis/chart/. Unlike other chart APIs I have seen (Yahoo, for example), you don't need Javascript or any embedded code. Just a correctly formatted URL. There are plenty of examples at the Google code URL to get you started. Don't forget to avoid legends whenever possible, though I'm disappointed the API doesn't currently support much in the way of labeling.
I wouldn't mind seeing a Web form to help with formatting the URLs though. Anyone seen one yet?
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