Ran in to another interesting google gadget while searching for more interactive charts and visually appealing. You can see it in action on iGoogle spreadsheet
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The real time play gives a very good correlation between certain factors that do or do not effect the trend.
Another open source flash charts I found that you can interact with using ajax. I was going to use these for realtime network bandwidth/load display.
You can see them in action at Open Flash Charts
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