Whats the best Youtube cardio workout?

I use fitnessblender, they have some great HIIT workouts and they have a 'burn 1000 calories' video too among loads of others.

http://www.youtube.com/user/FitnessBlender?feature=fvst

Any Tae Bo/Kick Boxing workout is great cardio, the twists and kicks are great for your abs too, my favourites include;

Billy Blanks
Shadowboxer - Knockout Body Extreme Class .
Hasfit Cardio Kickboxing (they do all sorts cardio, weights, strength, specific groups www.hasfit.com)
NetFit.tv Kickboxing

I don't go to a gym I use YouTube and try lots of different workouts all the time depending on my mood and energy levels that day.