This is an attempt to visualize the Reinhart and Rogoff debt study, using a dataset put together by Herndon et al.. It has triggered a very lively discussion all around, including making it to the Colbert Show. You can find a nice summary on the Next New Deal blog.
Note: This interactive application was created using rCharts, shiny and Polychart. An accompanying blog post and reproducible source code will be posted on github.