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I especially like the time series mode where flot assigns very meaningful time labels on the x axis when you zoom in and out. (based on unix timestamps * 1000, so easy to retrieve from a database)

You can load data from python quite easily using an jquery ajax call and json.dumps() in the view on the server side.

In general it surprises me how well the client side graph libraries scale if you load a lot of data into them.

I've also found flot to be fairly powerful and have used it in a couple of projects.

Thanks for your suggestion, I had previously checked Flot but didn't use it because I didn't see a pie chart in the examples. Now I looked again and the pie chart is in the trunk version.

Use Flot on several of my sites. They have some nice plugins that I like too, and it integrates very nicely with jQuery.