Via Phil Windley, I think we have the understatement of the year:

Adding charts to Web sites just got a lot easier

He's not kidding - The chart below comes via this URL:

 
 
http://chart.apis.google.com/chart?cht=p3&chd=s:hW
&chs=250x100&chl=Hello|World

You can get the API specs from Google; there is a limit of 50,000 queries per day from your site - so large scale usage would require some kind of arrangement. However, this makes things like referral stat charting childs play.

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