Esri’s map portal “story telling with maps” has come up with a visualization of the distribution of the London Olympic medals by country. They also offer ways to create your own story telling web map. I also recommend the article on “Telling Stories with Maps” on Esri Insider.
Some interesting data sources in relation with the 2012 Olympics:
Data from Transport of London: https://api-portal.tfl.gov.uk/
Medals as JSON: http://hosted.stats.com/olympics/medals_widget/data.asp
The official Hashtags for the Games: