These folks spoke at BaseCamp and had a section on using YouTube for tutorials. This section is about 75-80% of the way through. http://sites.google.com/site/3dbasecamp2008/all-sessions-2008/promoting-your-work-using-google-resources
On their blog they have a section on Embedding high quality vidoe on YouTube. http://igloostudiosinc.blogspot.com/
Robert