I just went through ALL the youTube product videos you have up. They are awesome and very helpful.
The one thing I had trouble with was figuring out what order they should be viewed in. I know its not pretty to have #1, #2 etc in the title.
Maybe you can put "First video", "Second Video" etc in the begining of the video description. That way if I just go to your youtube account without using the "playlist" option users will be able to follow the series.