This year I participated in the "Zombie Shuffle" somewhat by accident. The event got some good press and was all over the regular QRP reflectors and forums but it just slipped my mind.
I just happened to be in the shack when I heard NN9K calling CQ BOO so I went back to him and started my very small 2013 Zombie Shuffle effort.
This event is put on by Paul, NA5N, and Jan, N0QT, every year since 1998. Here is the link http://www.zianet.com/qrp/zombie/zombie.htm
I like these events and think they are great for the QRP community.
Incidentally my score was 12,049 and the top operators will mostly likely have a score in the millions of points.