Before Game Development ever started, I did work on Data Visualization. I feel strongly that Data Visualization is a good filter for would be game developers. The combination of analysis and visualization is what any prospective game developer needs to test their skills.
iMa is a simple interactive map of Africa. The aim is to show states in Africa when the user places his mouse over them. It could serve as an educational tool. You can find the demo here -> https://dl.dropbox.com/u/55987683/africamap/index.html