During the Olympics a country medal count is standard. Though countries may rearrange the count priority to make them look a bit better (see below a German by Gold ranking and a USA by total medal ranking).
Many links and jumping off points are offered here.
German newspaper rendition: Germany #5 (US #2)
US newspaper rendition: U.S. #1 (Germany #6)
There are number of interesting graphical representations using Excel that show performance in a way that will engage students–and students can dig back into the data. Best of all, the excel files are available for download!
Here’s a link for the 2012 Olympic games from the UK Guardian: http://www.guardian.co.uk/sport/datablog/2012/jul/30/olympic-medals-visualised-guardian
Excel Visualization of Olympic Medal Count (through 2008, but includes prior Olympics–can compare years with results shown on globe): http://www.enterprise-dashboard.com/excel-visualization-of-olympic-medal-count/