Really great examples Alex, and I know this was more a technical how to style article, but I couldn't help myself. From a reporting users perspective people, pretty pretty please stop with all the pie charting.
Sure they're pretty, but bar graphs and line graph give you so much more insight.
How many times with pie chats do you just end up looking at the data labels, rather than the image, and those teeny tiny wedges, how do you get anything from looking at them?
Data tables, line graphs and bar graphs give you so much more IMO.