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Grafico is really good but lacks pie charts. You have to use http://g.raphaeljs.com/ for Pie's. But that is not so bad as Grafico uses raphaeljs.

Not having pie charts is by design. Grafico attempts to adhere to the chart design principles by Stephen Few, amongst others, who has this to say about pie charts: http://www.perceptualedge.com/articles/visual_business_intel...