I've been doing a little more work on my 3D pie-chart renderer. I've added beveling and tweaked colors to a point where I can render charts that -- in my opinion -- are a better quality than those produced from Apple's Numbers. Next step is to add labels over the main image. Povray does support rendering of True Type Fonts, but it is a 2D overlay that I'm looking for (not 3D text), so I plan to use PyCairo to render the labels. Once I've perfected the chart renderer I can build a polished web interface, and a web service for the render queue. All in Python, of course!
I know that 3D pie charts aren't as clear as their 2D counterparts, but I still think there is a place (and hopefully a market) for pretty charts like this. Even if it isn't a money-spinner, its still an interesting project, with some fun problems to solve!