I gave a talk at Information+ earlier this year that has now been posted. It's about pie charts! And it was a fun talk, too.
The video is focused a bit too much on me at the beginning, so you'll miss a few of the early jokes. But for the most part, you'll see the (much more important) slides rather than me. This is the talk I made the materials for that I then posted in my pie charts study results walk-through.
There were some really good talks at Information+ – I will post a selection of links to videos here in a bit.