Those were videos I put together as part of my time in Product Support, they weren't really official videos according to our training team. The only public place that you can find them is the forums.
You make a good point though, I'll put them up on my blog.
Cheers,
Kyle B
Revit MEP Product Manager
http://inside-the-system.typepad.com/
Kyle Bernhardt
Director
Building Design Strategy
Autodesk, Inc.