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) #1 | MVC Preview - Part 1 - Displaying Data 16 minutes, 41 ...

If you are an ASP.NET developer and have either Visual Studio 2005 or Visual Studio 2008 and want to learn how to build web applications using AJAX, then this is the site for you.  The Microsoft ASP.NET team has made available about 30 videos (ranging from 3 minutes to 30 minutes) that show to use most if not all of the ASP.NET AJAX ...