jqPlot bakes up the best pie and donut charts you've ever tasted! Like bar and filled line plots, pie and donut slices highlight when you mouse over.
Too many calories in that pie? Get all the taste without the filling! Highlighting and data labels are still supported. You can even cut out the slices!
Coming straight from the same bakery, donut plots have nearly identical options as pie charts.
For donuts you can fill the empty space in the centre with useful total sum information.