First, a double HT to Chartporn for these links.
First from The New York Times, comes this simple and easy to understand graphic which focuses on the main players in this financial disturbance.
Next from Flickr, we see this more original and visually appealing take on the European debt crisis. And it's downloadable in a variety of sizes. I especially like the "Debt Trip" and "Debt Trap" visualization in the upper right hand corner. I think that has general application for use with students.
I would welcome you to share your thoughts on these charts as well as your possible uses for the classroom.