Jacob has written a cool templatetag for rendering Google Charts. (I bet the new cache-tag will come in handy with this!)
Also, worth noting that the code is in Mercurial repository. I love hg, but I very much dislike the web interface for it. It most definitely sucks big time; its too complex for mere mortals to use and it assumes that you are familiar with revision control vocabulary. In case you don't have Mercurial installed, you can download zipped archives from the project summary page (at http://toys.jacobian.org/hg/googlecharts).