Most of you are aware but this weekend (and until tomorrow) is Dreamhack, the worlds largest LAN party. I came across an interesting page where you can track their live bandwidth usage. Everyone should take a peak at this. They are tracking a bunch of different variables. One that I find interesting is the breakdown comparing traffic between WoW, HoN, SC2, LoL, D3, and COD BLOPS. 

http://dashboard.dreamhack.se/