Just found http://www.lynda.com.
Unlike random YouTube videos, these are professionally edited.
Not everything on YouTube is poorly edited. Some are really good.
Having done a few webcasts for O'Reilly (and I have another scheduled for January 2016,) I know that my "you knows" -- you know -- and my "umms" are -- umm -- annoying.
I know professionals -- actors, pastors, lawyers -- who can extemporize really well. And it raises the bar a lot.
But the idea of having an editor clean up the "you knows" is appealing.