Jensen Kimmitt, the Canadian national champion, won in Category 1A ("1A-The player uses a long sleeping yo-yo to perform string tricks which usually require the manipulation of the string.")
lots of people are really good at yo-yoing. search youtube for 2010 world yoyo contest and watch some of the other players. i liked jensen's 2010 california state contest video more than this one. look for that on youtube as well.
neat!