Check out this chart of nationalities winning the World Memory Championships:
Clearly the Chinese have taken this contest by storm. Of course it helps that the 2010 and 2011 WMC were on the PRC mainland, but that can't fully explain how they filled the leaderboard to bursting. So the 2012 WMC back in London this December will be very exciting.
It was interestingly difficult to find Mr. Wang Feng, winner of the 2010 and 2011 championships, online. The 世界记忆锦标赛（WMC) has no Chinese-language wikipedia page, only a "Baidu Baike" encyclopedia page. Also, the Chinese characters of Wang Feng's name are nowhere to be found on the WMC website. However by guessing some translations of WMC and guessing Wang Feng's name, I found the right pages. Wang Feng has a blog, and has published a memory manual titled 记忆王子教你轻松记, that is, "Memory Prince Teaches You to Chillax while Memorizing," (my own translation).
This seemingly disconnected email is a result of my watching this TED talk by Josh Foer, and reading his book on the memory championships and memory methods. I started working on these methods this summer 2012 with my father to help him in his recovery from his stroke, and for myself to learn languages and economic data faster.