On today’s special This Year in Youtube 2010: Part 1, Lon Harris and Matt Raub will be counting down the top 20 hottest videos that ruled the world of Youtube this past year. Videos include “Hot ‘N Cold” with Katy Perry and Elmo, the Old Spice campaign with Isaiah Mustafa, and pure, wholesome acting from Nicholas Cage. Be sure to catch This Year In Youtube: Part 2 in 2011! From all of us at This Week in Youtube, Happy Holidays!