The Razorback videos are excellent.
There's a dozen or so on youtube (search for trainz tutorial), but the ones I've tried to watch don't teach you much. I'm about to make some for my new web site (opening January 1) so give me some suggestions and I'll see what I can do. I have two in mind already:
1. A video of my tutorial "How to create a double slip switch"
2. How to place a plan on a baseboard so that you can trace a route.
I can probably get them done pretty quickly, but suggestions would be appreciated.