UPDATED: Links fixed…our apologies for the bad URLs on the images.
I just ran across some really nice How to videos from Scott Hanselman on the ASP.NET MVC Preview. They are very much demonstration-oriented and very explanatory.
Here are the video’s and links: (These links are subject to changing, but are accurate as of this posting)
16 minutes, 41 seconds
18 minutes, 38 seconds
12 minutes, 56 seconds
23 minutes, 20 seconds