Don't think anyone beats Zuzana Light. Although her workouts on youtube are limited to zwow 70 I believe. now you have to join her site for new workouts.. I think she may have even set the trend for all the 20-25 minutes coming out lately.
Jessica Smith also has a youtube channel with full workouts.
There's a few Buti workouts (be careful to not throw your back out or hips out doing these)
I also found this woman, https://www.youtube.com/user/TheTcampoli
looks like Tracy Anderson type workouts.
There's also B-Fit (I think this also is the one with Jillian Michaels workouts)
We are lucky that so many people put workouts out there on the internet so anyone can get into shape! Something for everyone.